manila philippine military liberate southern marawi city matter days country arm force chief say monday deaths two key militant leaders say would lead crumble pro-islamic state alliance body omarkhayam maute isnilon hapilon retrieve identify authorities still 30 fighters combat zone disarray general eduardo ano tell televise news conference top malaysian operative mahmud ahmad foreign fighters still believe battle zone say add would letup fight wipe group loyal islamic state marawi retake philippine military chief say 'matter days marawi liberate