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Medics carry an injured woman on a stretcher to an ambulance after a suspected suicide bomber detonated an explosive device at the entrance of the U.S. Embassy in the Turkish capital, Ankara, Turkey, Friday Feb. 1, 2013. The bomb appeared to have exploded inside the security checkpoint at the entrance of the visa section of the embassy. A police official said at least two people are dead. (AP Photo/Burhan Ozbilici)

A U.S. soldier stands guard at the entrance of the U.S. embassy in Ankara February 1, 2013. A suicide bomber killed a Turkish security guard at the U.S. embassy in Ankara on Friday, blowing the door off a side entrance and sending smoke and debris flying into the street. Ankara Governor Alaaddin Yuksel said the attacker was inside U.S. property when the explosives were detonated. The blast sent masonry spewing out of the wall of the side entrance, but there did not appear to be any more significant structural damage. REUTERS/Stringer

A security officer runs after an explosion at the entrance of the U.S. embassy in Ankara February 1, 2013. A suicide bomber killed a Turkish security guard (not in picture) at the U.S. embassy in Ankara on Friday, blowing the door off a side entrance and sending smoke and debris flying into the street. REUTERS/Yavuz Ozden/Milliyet Daily Newspaper

Turkish police bomb experts inspect the site after an explosion at the entrance of the U.S. embassy in Ankara February 1, 2013. A suspected suicide bomber detonated explosives in an attack which killed two people at the U.S. embassy in Ankara on Friday, the provincial governor Alaaddin Yuksel told reporters. REUTERS/Stringer

Medics and firefighters carry an injured woman on a stretcher to an ambulances after a suicide bomber had detonated an explosive device at the entrance of the U.S. Embassy in the Turkish capital, Ankara, Turkey, Friday, Feb. 1, 2013. A suspected suicide bomber detonated an explosive device at the entrance of the U.S. Embassy in the Turkish capital on Friday, killing himself and one other person, officials said. (AP Photo/Burhan Ozbilici)

Turkish police forensic experts inspect the site after an explosion at the entrance of the U.S. embassy in Ankara February 1, 2013. A suspected suicide bomber detonated explosives in an attack which killed two people at the embassy on Friday, the provincial governor Alaaddin Yuksel told reporters. REUTERS/Stringer

Elevated view of the side entrance of the U.S. Embassy in the Turkish capital, Ankara, after a suspected suicide bomber detonated an explosive device, Friday Feb. 1, 2013. The bomb appeared to have exploded inside the security checkpoint at the entrance of the visa section of the embassy. A police official said at least two people are dead.(AP Photo)

Gate 2 of the embassy just after a suicide bomber detonated an explosive device at the entrance of the U.S. Embassy in the Turkish capital, Ankara, Turkey, Friday, Feb. 1, 2013. A suspected suicide bomber detonated an explosive device at the entrance of the U.S. Embassy in the Turkish capital on Friday, killing himself and one other person, officials said. (AP Photo/IHA)

Medics and firefighters carry an injured woman on a stretcher to an ambulance after a suicide bomber detonated an explosive device at the entrance of the U.S. Embassy in the Turkish capital, Ankara, Turkey, Friday, Feb. 1, 2013. A suspected suicide bomber detonated an explosive device at the entrance of the U.S. Embassy in the Turkish capital on Friday, killing himself and one other person, officials said. (AP Photo/IHA)

Rescuers take on February 1, 2013 a victim of a blast outside the US Embassy in Ankara to a waiting ambulance. Two security guards were killed in the blast outside the US embassy, local television reported, amid speculation it was a suicide attack. The force of the explosion damaged nearby buildings in the Cankaya neighborhood where many other state institutions and embassies are also located. AFP PHOTO / ADEM ALTAN/AFP/Getty Images

Emergency personnel are seen in front of a side entrance of the U.S. Embassy in the Turkish capital, Ankara, after a suspected suicide bomber detonated an explosive device, Friday Feb. 1, 2013. The bomb appeared to have exploded inside the security checkpoint at the entrance of the visa section of the embassy. A police official said at least two people are dead. (AP Photo/Burhan Ozbilici)

Emergency personnel are seen in front of a side entrance of the U.S. Embassy in the Turkish capital, Ankara, after a suspected suicide bomber detonated an explosive device, Friday Feb. 1, 2013. The bomb appeared to have exploded inside the security checkpoint at the entrance of the visa section of the embassy. A police official said at least two people are dead. (AP Photo/Burhan Ozbilici)

Emergency personnel block an entrance of the U.S. Embassy in the Turkish capital, Ankara, after a suspected suicide bomber detonated an explosive device, Friday Feb. 1, 2013. The bomb appeared to have exploded inside the security checkpoint at the entrance of the visa section of the embassy. A police official said at least two people are dead. (AP Photo/Burhan Ozbilici)

US ambassador to Turkey Francis J. Ricciardone (C, L) and provincial governor Alaaddin Yuksel (C, R) give a press point on February 1, 2013 at the site of a blast outside the US Embassy in Ankara. A Turkish security guard was killed and several other people wounded in a suicide bombing at the entrance to the highly-fortified US embassy in Ankara on February 1, officials said. The force of the blast damaged nearby buildings in the upmarket Cankaya neighborhood of the capital where many other state institutions and embassies are also located. AFP PHOTO / ADEM ALTAN/AFP/Getty Images