marawi city philippines philippine teachers tuesday give families return destroy lakeside city marawi course identify unexploded bomb home warn stay clear five-month battle retake marawi pro-islamic state rebel leave city ruin government announce end military operations monday country big security crisis years allow rebuild rehabilitation efforts begin .. teachers teach children parent recognize live mortar shell grenades aircraft rocket improvise explosive devices villages security force use artillery bombardment air strike flush gunmen endure 154 days offensive stockpile huge amount weapons include bomb warn teachers include draw inquisitive children hammer bomb try set fire help us parent understand tell children touch get near bomb say sobaida sidic housewife attend train authorities say 920 militants 165 troop police least 45 civilians kill conflict displace 300,000 people lominog manoga principal school marawi oversee train say important teach people risk philippine president rodrigo duterte declare marawi city liberate last week even though fight actually sunday say important vigilant country could escape islamic state clutch evil families return ruin philippine city teach identify bomb