At least 16 people have been killed in the southern Philippines in two separate bomb attacks and a raid on a town by armed men. One person was killed in each of the bomb attacks and the raid on the town killed 14 civilians. The raid was carried out by 50 armed men who rounded up the inhabitants of Calauit town, on Mindanao island, and then opened fire, the military said. The security forces have blamed Muslim separatist guerrillas for the raid and one of the bomb attacks. The rebels - the Moro Islamic Liberation Front (MILF) - have denied involvement. Fighting broke out between the two sides last week when the military attacked an MILF stronghold on Mindanao, in an attempt to flush out a separate kidnap group which the US says are terrorists. The military says 140 people, mostly rebels, died in the offensive.