Bomb rips through Manila bus

A bomb ripped through a bus in the Philippines today, killing at least three people and injuring others, police said.

A bomb ripped through a bus in the Philippines today, killing at least three people and injuring others, police said.

The incident at 10 p.m. (1400 GMT) occurred in Quezon City, on the outskirts of Manila, despite tightened security following two deadly bombings yesterday in the southern Philippines and a grenade blast after midnight Friday in Manila's financial district.

The explosion in the back of the bus ripped off its roof and part of its carriage. There was no immediate claim of responsibility. Officials have said the al–Qaida–linked Abu Sayyaf group was the most likely suspect for Thursday's bombings in downtown Zamboanga city that killed seven people and injured more than 150.

The group recently threatened attacks in retaliation for an ongoing military offensive against it, and has been blamed for an Oct. 2 bombing in Zamboanga that killed four people, including an American Green Beret commando.