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MANILA, Philippines (AP) _ A grenade exploded in a crowded bus station in the southern Philippines on Thursday, killing at least four people and wounding several others, police and military officials said.

Unidentified men either hurled or left the grenade, which exploded in the station in Kidapawan city, in North Cotabato province, killing two people instantly. Two others died on the way to the hospital, police said.

No one immediately claimed responsibility for the blast.