marawi city philippines islamic state-linked militants besiege southern philippines city marawi send feelers prepare surrender three half months fight military say monday philippine force use loudspeakers urge militants give tell estimate 50 60 fighters leave city live would spar disarm change black clothe walk designate location hopefully surrender within next days spokesman colonel romeo brawner tell news conference feelers definitely feelers add decline elaborate surrender offer come renew short-lived effort philippine president rodrigo duterte start back-channel talk militants former marawi mayor omar solitario ali act intermediary duterte saturday rule possibility allow rebel flee exchange release dozens hostages two troop kill weekend take 147 number security force kill marawi conflict 655 militants 45 civilians kill accord army troop engage run battle militant alliance lead abdullah omarkhayam maute maute group isnilon hapilon factional head abu sayyaf group islamic state so-called emir southeast asia 20 structure capture many lade booby trap commercial high-rise build use sniper position thwart government force brawner describe operations big accomplishment consider enemy establish strong defensive position areas marawi see citizens return shop school re-open city remain desert center wasteland pummel daily air strike grind battle resistance militants frustrate 400,000 residents displace area raise question relatively islamists take control lakeside town hold significant part receive lot question take long government recover area say brawner really difficult urban fight unite state give technical logistics support philippine military monday announce deploy gray eagle unman surveillance aircraft marawi australia also provide two p3-orion surveillance plan last week announce would send defense personnel train philippine troop graphic main islamic militant group mindanao evolve click graphic islamic militant strongholds mindanao click philippines say rebel ready surrender troop advance marawi