At least 17 people were killed as two bombs hit a church on a southern Philippine island that is a stronghold of Islamist militants, the military said Sunday, just days after a regional vote for a new Muslim autonomous region. The first blast occurred inside the Catholic church on war-torn Jolo on Sunday morning as mass was being celebrated, and was followed by a second explosion in the parking lot as troops responded, regional military spokesman Lieutenant Colonel Gerry Besana told AFP.