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ALEPPO, SYRIA - MAY 8: At least 50 Assad forces killed in a bomb attack by members of Islamic Front in target of Carlton Citadel Hotel Aleppo, headquarters Assad forces near the Citadel of Aleppo in Aleppo, second big city of Syria on May 8, 2014. (Photo by Salih Mahmud Leyla/Anadolu Agency/Getty Images)

ALEPPO, SYRIA - MAY 8:  At least 50 Assad forces killed in a bomb attack by members of Islamic Front in target of Carlton Citadel Hotel Aleppo, headquarters Assad forces near the Citadel of Aleppo in Aleppo, second big city of Syria on May 8, 2014. (Photo by Salih Mahmud Leyla/Anadolu Agency/Getty Images)