In this photo released by the Syrian official news agency SANA, black smoke and flame rise from the rooftop of a building that was, according to SANA, attacked by a mortar shelled by the Syrian rebels in Damascus, Syria, Saturday April 5, 2014. Al-Qaida's leader, Ayman al-Zawahri, called on fighters to determine who killed his chief representative in Syria, a man many militant groups believe died at the hands of a rival militia, in a move that highlighted a conflict between rebels that has killed hundreds. (AP Photo/SANA)
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