beirut islamic state evacuation convoy try reach territory east syria split two bus remain open desert others turn back government-held areas u.s.-led coalition fight group say sunday syrian government lebanon hezbollah group offer convoy 300 lightly arm fighters 300 family members safe passage week ago return islamic state surrender enclave syria-lebanon border however coalition block convoy enter islamic state territory east syria near border iraq cratering roads destroy bridge say oppose evacuation deal last solution one group remain open desert north west al-bukamal group head west towards palmyra coalition say email statement saturday hezbollah say six bus safely cross syrian government territory long responsibility syrian government warn unite state bus desert include elderly people pregnant women casualties accuse stop humanitarian aid reach convoy coalition say contact russia deliver message syrian government would still let convoy pass offer suggestions save civilians suffer food water provide convoy say without give detail coalition say target convoy directly contain civilians say statement strike 85 fighters near convoy also strike 40 vehicles near convoy include tank artillery system arm vehicles transport vehicles seek help move fighters convoy territory say u.s.-led coalition say islamic state syria convoy split two