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A Syrian rebel crosses a street while trying to dodge sniper fire in the old city of Aleppo in northern Syria on March 11, 2013. Syria warned on March 12 it is ready to fight "for years" against rebels, as world powers worked on a new initiative to find regime officials suitable for peace talks with the opposition. JM LOPEZ/AFP/Getty Images ( 518125593 )

Smoke rises after what activists said was shelling by forces loyal to Syria's President Bashar al-Assad in the Al-Khalidiya neighborhood of Homs March 6, 2013. Picture taken March 6, 2013. REUTERS/Muhammad Ibrahim/Shaam News Network/Handout ( SYRIA-CRISIS/ )

Free Syrian Army fighters run for cover as a tank shell explodes on a wall during heavy fighting in the Ain Tarma neighborhood of Damascus January 30, 2013. REUTERS/Goran Tomasevic ( SYRIA-CRISIS/ )

Women walk along a damaged street filled with debris in Deir al-Zor April 1, 2013. Picture taken April 1, 2013. REUTERS/ Khalil Ashawi ( SYRIA-CRISIS/ )

A Free Syrian Army fighter takes position inside a room as he points his weapon through a hole in Aleppo's Saif al-Dawla district March 20, 2013. REUTERS/Giath Taha ( SYRIA-CRISIS/ )

In this Tuesday March 19, 2013, citizen journalism image provided by Aleppo Media Center AMC which has been authenticated based on its contents and other AP reporting, black smoke rise from buildings due to government forces shelling, in Aleppo, Syria. Syria's main opposition group demanded Wednesday a full international investigation into an alleged chemical weapons attack in the country's north, calling for a team to be sent to the village where it reportedly occurred. (AP Photo/Aleppo Media Center, AMC) ( Mideast Syria )

A fighter from Islamist Syrian rebel group Jabhat al-Nusra runs with his weapon as their base is shelled in Raqqa province, eastern Syria, March 14, 2013. REUTERS/Hamid Khatib ( SYRIA-CRISIS/ )

A view is seen of a damaged mosque at Baba Amro neighborhood in Homs city, after clashes between forces loyal to Syrian President Bashar al-Assad and fighters of the Free Syrian Army,is seen in this handout photograph distributed by Syria's national news agency SANA on March 27, 2013. REUTERS/SANA/Handout ( SYRIA-CRISIS/ )

Free Syrian Army fighters carry their weapons and cheer as they drive in the northeastern provincial capital of Raqqa after capturing it, March 4, 2013. Opposition sources and residents said rebel fighters captured Raqqa on Monday and toppled a statue of President Bashar al-Assad's father, in what would be the first major city to be captured since the revolt erupted against four decades of Assad family rule in March 2011. Picture taken March 4, 2013. REUTERS/Mohamed Al-Husain/Shaam News Network/Handout ( SYRIA-CRISIS/RAQQA )

Members of the Free Syrian Army stand beside a rocket launcher, in the old city of Aleppo March 2, 2013. Picture taken March 2, 2013. REUTERS/Saad Abobrahim ( SYRIA-CRISIS/ )

Gas cylinders are displayed for sale on a street in Aleppo March 24, 2013. REUTERS/Giath Taha ( SYRIA-CRISIS/ )

In this photo released by the Syrian official news agency SANA,Mohammed Zaal al-Ali, left, is sworn in as governor of Hasaka province, by Syrian President Bashar Assad, right, in Damascus, Syria, Thursday, March 28, 2013. (AP Photo/SANA) ( Mideast Syria )

Civilians search for casualties inside a building, which activists said was damaged after it came under fire by a Syrian Air Force fighter jet loyal to Syria's President Bashar al-Assad, in Kefr Hamra area, north of Aleppo March 19, 2013. Picture taken March 19, 2013. REUTERS/Giath Taha ( SYRIA-CRISIS/ )

Rebels clash with Syrian government forces at Saif al-Dawla district in the northern Syrian city of Aleppo on March 23, 2013. In Aleppo, nine months into fighting that has devastated many districts, life has slowly started to return to what passes for normal in Syria today. BULENT KILIC/AFP/Getty Images ( 518405639 )

A picture of Syria's President Bashar al-Assad riddled with holes is seen on the facade of the police academy in Aleppo, after it was captured by Free Syrian Army fighters, March 4, 2013. On Sunday rebels said they captured a police academy on the outskirt of Aleppo, after days of fighting in which rebels killed 150 soldiers, while sustaining heavy casualties. REUTERS/Mahmoud Hassano ( SYRIA-CRISIS/ )

Syrians wait to receive a meal in the Bustan al-Qasr district of the northern city of Aleppo on March 26, 2013. Rebels won Syria's long-vacant seat at the Arab League during the organization's annual summit in Doha, despite rifts within the opposition that have marred their political gains. BULENT KILIC/AFP/Getty Images ( 518475059 )

United Nations peacekeepers put on protective gear before driving through the Kuneitra border crossing between Israel and Syria, in the Israeli occupied Golan Heights March 8, 2013. Israel voiced confidence on Thursday that the United Nations could secure the release of U.N. peacekeepers seized by Syrian rebels near the Golan Heights on Wednesday, signaling it would not intervene in the crisis. Israel captured the Golan Heights in the 1967 Middle East war and annexed it in 1981 in a move not recognized internationally. REUTERS/Baz Ratner ( SYRIA-CRISIS/ISRAEL )

A man stands inside a damaged house in Deir al-Zor March 7, 2013. Picture taken March 7, 2013. REUTERS/ Khalil Ashawi ( SYRIA-CRISIS/ )

Smoke rises after what activists said was shelling by forces loyal to Syria's President Bashar al-Assad in the old city of Homs March 22, 2013. Picture taken March 22, 2013. REUTERS/Mohamed Ibrahim/Shaam News Network/Handout ( SYRIA-CRISIS/ )

Children talk to a boy holding a weapon in a damaged street in Homs March 25, 2013. Picture taken March 25, 2013. REUTERS/Yazan Homsy ( SYRIA-CRISIS/ )

A Free Syrian Army fighter carries his weapon as he walks along a street in Deir al-Zor March 13, 2013. Picture taken March 13, 2013. REUTERS/ Khalil Ashawi ( SYRIA-CRISIS/ )

Free Syrian Army fighters carry their weapons as they sit inside a house in Aleppo's Saif al-Dawla district March 20, 2013. REUTERS/Giath Taha ( SYRIA-CRISIS/ )

Free Syrian Army fighters take positions as one of them points his weapon through a hole in a wall in Aleppo's Saif al-Dawla district March 20, 2013. REUTERS/Giath Taha ( SYRIA-CRISIS/ )

A tank belonging to forces loyal to Syria's President Bashar al-Assad is set on fire during what activists said were clashes between government forces and the Free Syrian Army, in the main south highway near Damascus, March 19, 2013. REUTERS/Mohammed Dimashkia ( SYRIA-CRISIS/ )

A man runs as smoke rises from buildings damaged by what activists said were shelling by forces loyal to President Bashar al-Assad in Raqqa province, eastern Syria, March 14, 2013. REUTERS/Hamid Khatib ( SYRIA-CRISIS/ )

A man runs with a fire extinguisher as smoke rises from buildings damaged by what activists said were shelling by forces loyal to President Bashar al-Assad in Raqqa province, eastern Syria, March 14, 2013. REUTERS/Hamid Khatib ( SYRIA-CRISIS/ )

A Free Syrian Army fighter carrying a weapon, walks along a street lined with damaged buildings in al-Harak city in Deraa March 28, 2013. Picture taken March 28, 2013. REUTERS/Thaer Abdallah ( SYRIA-CRISIS )

Fighters from the Aoun-bi-allah Brigade, which operates under the Free Syrian Army, rest in Aleppo March 16, 2013. REUTERS/Giath Taha ( SYRIA-CRISIS )

Members of the Free Syrian Army take up position with their weapons during clashes with forces loyal to Syria's President Bashar al-Assad, in the old city of Aleppo March 2, 2013. Picture taken March 2, 2013. REUTERS/Saad Abobrahim ( SYRIA-CRISIS/ )

A Free Syrian Army fighter runs for cover across a street in Aleppo March 18, 2013. Picture taken March 18, 2013. REUTERS/Abdalghne Karoof ( SYRIA-CRISIS )

Syrians walk past a partially destroyed building in the northern city of Aleppo on March 22, 2013. The UN lamented the escalating violence in Syria and extended a probe into widespread human rights violations in the war-torn country. AFP PHOTO/BULENT KILIC ( 518379112 )

Syrian refugee children peek from their tent at the Bab Al-Salam refugee camp in Azaz, near the Syrian-Turkish border March 25, 2013. REUTERS/Giath Taha ( SYRIA-CRISIS/ )

Syrian refugee kids, sit inside their tent at a small refugee camp, in Ketermaya village southeast of Beirut, Lebanon, Thursday March 14, 2013. The number of registered Syrian refugees jumped 10 percent in just one week to more than 1.1 million, a U.N. aid official said Thursday as France pushed for quickly lifting a European Union ban on arming Syrian rebels. (AP Photo/Hussein Malla) ( Mideast Lebanon Syria Refugees )

A Syrian refugee gets his hair cut at the Bab Al-Salam refugee camp in Azaz, near the Syrian-Turkish border March 25, 2013. REUTERS/Giath Taha ( SYRIA-CRISIS/ )

Children attend a class at the Bab Al-Salam refugee camp in Azaz, near the Syrian-Turkish border March 25, 2013. REUTERS/Giath Taha ( SYRIA-CRISIS/ )

A group of children attends a lesson conducted by activists, who say they provide basic education for children after schools were closed in the city, in a mosque in Aleppo March 23, 2013. REUTERS/ Giath Taha ( SYRIA-CRISIS/ )

A view is seen of a damaged building and mosque at Baba Amro neighborhood in Homs city, after clashes between forces loyal to Syrian President Bashar al-Assad and fighters of the Free Syrian Army, is seen in this handout photograph distributed by Syria's national news agency SANA on March 27, 2013. REUTERS/SANA ( SYRIA-CRISIS/ )

A Syrian refugee displays items for sale at the Bab Al-Salam refugee camp in Azaz, near the Syrian-Turkish border March 25, 2013. REUTERS/Giath Taha ( SYRIA-CRISIS/ )

A view shows debris and blood after mortar bombs landed on the canteen of Damascus University's College of Architecture, March 28, 2013 in this handout photograph distributed by Syria's national news agency SANA.Twelve Syrian students were killed on Thursday when rebel mortar bombs landed on the canteen of Damascus University's College of Architecture, state-run media said. Al-Ikhbariya television showed images of doctors pumping the chests of at least two young men and blood splattered on the floor of what appeared to be an outdoor canteen. REUTERS/SANA/Handout ( SYRIA-CRISIS/STUDENTS )

In this photo released by the Syrian official news agency SANA, Syrian doctors treat an injured man who was wounded at the open-air cafeteria at Damascus University in the central Baramkeh district, in Damascus, Syria, Thursday, March 28, 2013. Mortar shells slammed into a cafeteria at Damascus University, killing at several people and wounding scores, according to state media and an official. It was the deadliest in a string of such attacks on President Bashar Assad's seat of power, state media and an official said. (AP Photo/SANA) ( Mideast Syria )

Medics help a man who is injured after mortar bombs landed on the canteen of Damascus University's College of Architecture March 28, 2013 in this handout photograph distributed by Syria's national news agency SANA. Twelve Syrian students were killed on Thursday when rebel mortar bombs landed on the canteen of Damascus University's College of Architecture, state-run media said. Al-Ikhbariya television showed images of doctors pumping the chests of at least two young men and blood splattered on the floor of what appeared to be an outdoor canteen. REUTERS/SANA/Handout ( SYRIA-CRISIS/STUDENTS )

People search for casualties under the rubble at a site hit by what activists say was a Scud missile in the town of Hretan, northeast of Aleppo March 29, 2013. REUTERS/ Giath Taha ( SYRIA-CRISIS/ )

A Syrian man sitting on a fallen statue of former Syrian President Hafez Assad in a central square in Raqqa, Syria on March. 5, 2013. Since Raqqa fell under rebel control last week, opposition fighters have posted guards at government buildings to prevent looting, brought down the price of bread and opened a telephone hotline for residents to report security problems. Raqqa is shaping up as a test case for how rebels will administer their areas. Arabic on the fallen statue reads, "tomorrow will be better." (AP Photo/Aleppo Media Center AMC, File) ( Mideast Syria )

Women members of the Al-Ikhlas (Loyalty) Battalion rest with their weapons in Aleppo March 31, 2013. The Al-Ikhlas (Loyalty) Battalion is a security battalion that involves women that are in charge of erecting sudden checkpoints and raiding houses that contain women in Aleppo. The battalion is under the Ghorabaa (Strangers) Al-Sham Front, controlled by the Free Syrian Army. REUTERS/Giath Taha ( SYRIA-CRISIS/ )

A woman member of the Al-Ikhlas (Loyalty) Battalion, stops a van at a checkpoint in Aleppo March 31, 2013. The Al-Ikhlas (Loyalty) Battalion is a security battalion that involves women that are in charge of erecting sudden checkpoints and raiding houses that contain women in Aleppo. The battalion is under the Ghorabaa (Strangers) Al-Sham Front, controlled by the Free Syrian Army. REUTERS/Giath Taha ( SYRIA-CRISIS/ )

A woman member of the Al-Ikhlas (Loyalty) Battalion, stops a van at a checkpoint in Aleppo March 31, 2013. The Al-Ikhlas (Loyalty) Battalion is a security battalion that involves women that are in charge of erecting sudden checkpoints and raiding houses that contain women in Aleppo. The battalion is under the Ghorabaa (Strangers) Al-Sham Front, controlled by the Free Syrian Army. REUTERS/Giath Taha ( SYRIA-CRISIS/ )

Children wait to collect water in Aleppo April 2, 2013. Around Syria, water shortages are worsening and supplies are sometimes contaminated, putting children at increased risk of diseases. REUTERS/Giath Taha ( SYRIA-CRISIS/ )

Syrian refugee women make Syrian flat bread, as they prepare lunch for the United Nations High Commissioner for Refugees, UNHCR, chief Antonio Guterres, during his visit at a small refugee camp, in Ketermaya village southeast of Beirut, Lebanon, Thursday March 14, 2013. The number of registered Syrian refugees jumped 10 percent in just one week to more than 1.1 million, a U.N. aid official said Thursday as France pushed for quickly lifting a European Union ban on arming Syrian rebels. (AP Photo/Hussein Malla) ( Mideast Lebanon Syria Refugees )

A Syrian refugee girl carries her sister, as she listens to the United Nations High Commissioner for Refugees, UNHCR, chief Antonio Guterres, not seen, during his visit to a Syrian refugee camp, in Ketermaya village southeast of Beirut, Lebanon, Thursday March 14, 2013. The number of registered Syrian refugees jumped 10 percent in just one week to more than 1.1 million, a U.N. aid official said Thursday as France pushed for quickly lifting a European Union ban on arming Syrian rebels. (AP Photo/Hussein Malla) ( APTOPIX Mideast Lebanon Syria Refugees )

The coffin of Sunni Muslim cleric Mohamed Saeed al-Bouti, who died in a suicide bomb attack, is carried during his funeral ceremony on March 23, 2013 at the Omayyad mosque in Damascus, Syria. The suicide bomb attack in a mosque in Damascus has killed 42 people on March 21, including Saeed al-Bouti, wounding dozens of others, Syrian health ministry said. AFP PHOTO/LOUAI BECHARA ( 518405640 )

A Free Syrian Army fighter mourns near the grave of his comrade who died in what the Free Syrian Army said were clashes with forces loyal to Syria's President Bashar al-Assad in Qusair town near Homs March 25, 2013. Picture taken March 25, 2013. REUTERS/Trad al-Zouhouri//Shaam News Network/Handout ( SYRIA-CRISIS/ )

A U.N. peacekeeper from the UNDOF force looks through binoculars as he guards on a watch tower at the Quneitra Crossing between Syria and the Israeli-controlled Golan Heights, Friday, March 8, 2013. Syrian rebels who seized 21 Filipino U.N. peacekeepers in the Golan Heights want the Red Cross to escort them out of the area because of fighting with Syrian government forces, the Philippine military said Friday. The 21 peacekeepers were seized Wednesday near the Syrian village of Jamlah, just a mile from the Israeli-controlled Golan Heights in an area where the U.N. force had patrolled a cease-fire line between Israel and Syria without incident for nearly four decades. (AP Photo/Ariel Schalit) ( Mideast Israel Syria UN )