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Syrians gather at the scene of a car bomb explosion in al-Khudary Street, in the Karm al-Loz neighbourhood of the central Syrian city of Homs, on April 9, 2014. More than 150,000 people have been killed in Syria since the conflict began in March 2011, a monitoring group said in a new toll released. (AFP/Getty Images) ( 528802144 )

A handout picture released by the official Syrian Arab News Agency (SANA) shows Syrians carrying a wounded woman following a car bomb explosion in al-Khudary Street in the Karm al-Loz neighbourhood of the central Syrian city of Homs on April 9, 2014. More than 150,000 people have been killed since the revolt began in March 2011 and nine million have been driven from their homes, including 2.6 million international refugees. (AFP PHOTO /HO/SANA) ( 528804693 )

Flames engulf a vehicle following a car bomb along al-Khudary Street in the Karm al-Loz neighborhood in the city of Homs on April 9, 2014. More than 150,000 people have been killed in Syria since the conflict began in March 2011, a monitoring group said in a new toll released. (AFP/Getty Images) ( 528802035 )

Emergency services spray water on a building following a car bomb explosion in al-Khudary Street, in the Karm al-Loz neighbourhood of the central Syrian city of Homs, on April 9, 2014. More than 150,000 people have been killed in Syria since the conflict began in March 2011, a monitoring group said in a new toll released. (AFP/Getty Images) ( 528802147 )

A handout picture released by the official Syrian Arab News Agency (SANA) shows a wounded man at the scene of a car bomb explosion in al-Khudary Street in the Karm al-Loz neighbourhood of the central Syrian city of Homs on April 9, 2014. More than 150,000 people have been killed since the revolt began in March 2011 and nine million have been driven from their homes, including 2.6 million international refugees. (AFP PHOTO /HO/SANA) ( 528804691 )

Syrians carry a wounded man following a car bomb explosion in al-Khudary Street in the Karm al-Loz neighbourhood of the central Syrian city of Homs on April 9, 2014. More than 150,000 people have been killed since the revolt began in March 2011 and nine million have been driven from their homes, including 2.6 million international refugees. (AFP PHOTO /HO/SANA) ( 528803898 )

Syrians help a wounded man following a car bomb explosion in al-Khudary Street in the Karm al-Loz neighbourhood of the central Syrian city of Homs on April 9, 2014. More than 150,000 people have been killed in Syria since the conflict began in March 2011, a monitoring group said in a new toll released. (AFP/Getty Images) ( 528803824 )

A handout picture released by the official Syrian Arab News Agency (SANA) shows Syrians gathering at the scene of a car bomb explosion in al-Khudary Street in the Karm al-Loz neighbourhood of the central Syrian city of Homs on April 9, 2014. More than 150,000 people have been killed since the revolt began in March 2011 and nine million have been driven from their homes, including 2.6 million international refugees. (AFP PHOTO /HO/SANA) ( 528804699 )

Flames engulf a vehicle following a car bomb along al-Khudary Street in the Karm al-Loz neighborhood in the city of Homs on April 9, 2014. More than 150,000 people have been killed in Syria since the conflict began in March 2011, a monitoring group said in a new toll released. (AFP/Getty Images) ( 528802022 )

A handout picture released by the official Syrian Arab News Agency (SANA) shows Syrians gathering near burnt-out vehicles following a car bomb explosion in al-Khudary Street in the Karm al-Loz neighbourhood of the central Syrian city of Homs on April 9, 2014. More than 150,000 people have been killed since the revolt began in March 2011 and nine million have been driven from their homes, including 2.6 million international refugees. (AFP PHOTO /HO/SANA) ( 528804705 )

People and rescuers gather at the scene of a car bomb along al-Khudary Street in the Karm al-Loz neighborhood in the Syrian city of Homs on April 9, 2014. More than 150,000 people have been killed in Syria since the conflict began in March 2011, a monitoring group said in a new toll released. (AFP/Getty Images) ( 528802151 )