▁Sy rian ▁Army ▁advanced ▁from ▁Mid an , ▁taking ▁control ▁of ▁the ▁main ▁a venue ▁and ▁reaching ▁Z ah i ▁Hospital ▁in ▁Hal ak ▁neighbourhood . ▁Islam ists ▁continued ▁to ▁hold ▁the ▁side ▁streets ▁and ▁fighting ▁was ▁on going . ▁ ▁Early ▁in ▁December , ▁the ▁chemical ▁plant ▁S YS AC CO ▁was ▁taken ▁by ▁re bel ▁f igh ters ▁from ▁the ▁Al - N us ra ▁Front . ▁The ▁factory ▁produces ▁liquid ▁ch lor ine ▁among ▁other ▁chemical s . ▁ ▁On ▁ 5 ▁December , ▁Mor oc co ' s ▁honor ary ▁cons ul , ▁Moh amed ▁A la e ▁Edd in ne , ▁and ▁another ▁man ▁were ▁killed ▁by ▁a ▁group ▁of ▁armed ▁men ▁when ▁Edd in ne ▁tried ▁to ▁leave ▁a ▁hotel ▁in ▁Ale ppo . ▁ ▁She ikh ▁S ule iman ▁base ▁was ▁over run ▁by ▁opposition ▁forces ▁on ▁ 1 0 ▁December . ▁A ▁hundred ▁Army ▁soldiers ▁who ▁were ▁left ▁inside ▁the ▁base ▁retre ated ▁to ▁the ▁scientific ▁building ▁we aring ▁gas ▁mask s . ▁Al - N us ra ▁Front ▁led ▁the ▁attack ▁with ▁only ▁one ▁F SA ▁group ▁taking ▁part , ▁one ▁F SA ▁commander ▁said . ▁Many ▁of ▁the ▁f igh ters ▁were ▁from ▁Central ▁Asia ▁with ▁the ▁re bel ▁commander ▁coming ▁from ▁U z bek istan . ▁ ▁On ▁ 1 5 ▁December , ▁Colonel ▁Y use f ▁al - J ader , ▁army ▁officer ▁and ▁def ector ▁and ▁top ▁re bel ▁commander ▁for ▁the ▁Ta wh id ▁Brigade , ▁was ▁killed ▁in