MARAWI CITY, Philippines (Reuters) - Islamist militants holed up in a southern Philippines town have been cornered and their firepower is flagging, the military said on Thursday, as the five-week battle for control of Marawi City raged on. Source: [url=http://feeds.reuters.com/~r/Reuters/worldNews/~3/nJRFRq3ed1g/us-philippines-militants-idUSKBN19D0HH]Philippines says Islamist fighters trapped in corner of besieged town[/url]