At least three people were killed and seven wounded in a bomb attack on a Catholic mass in the insurgency-plagued southern Philippines on Sunday, officials said.
The blast took place during a regular service at Mindanao State University's gymnasium in Marawi, the country's largest Muslim city, regional police Chief Allan Nobleza said.
"We're investigating if it's an IED or grenade throwing," Nobleza said, referring to an improvised explosive device.
Mindanao State University issued a statement condemning "the act of violence," as it suspended classes and deployed more security personnel on the campus.