manila islamic state-inspired militants battle troop southern philippine city 154 days seek way two months fierce conflict government ignore proposal separatist negotiator minister say takeover marawi big security crisis decades philippines fuel concern islamic state indonesian malaysian extremists might great sway among minority muslims previously think abdullah maute one lead dawla islamiya rebel alliance city engage muslim leaders urge president rodrigo duterte let militants escape return release score captives one cleric say agakhan sharief marawi muslim cleric well know militant maute clan say around july 27 abdullah maute ask help arrange moro islamic liberation front milf separatist group peace government receive hostages escort militants city agree negotiate leave marawi condition milf involve sharief tell reuters tell go marawi guarantee military kill say problem serious time violence marawi kill 1,100 people mostly rebel city center destroy artillery government air strike military believe abdullah kill air strike early august body find brother co-leader omarkhayam kill oct. 16 along isnilon hapilon islamic state emir southeast asia government allow milf operate peace corridor marawi help rescue hundreds civilians milf top peace negotiator mohagher iqbal confirm maute make proposal government ignore formal negotiation role facilitate two side agree tell reuters reservations deal although maute members former milf doubt intentions sincerity know would honor deal score hostages escape rescue last months fight unclear many may kill authorities yet retrieve body battle zone still litter unexploded munition homemade bomb army say militant holdouts still hide grind zero defence secretary delfin lorenzana tell reuters duterte aware maute request flee marawi exchange hostages offer little late many soldier kill say propose first week many casualties would ok. late duterte long incline entertain deal philippine militants seek july deal end marawi conflict intermediaries say