Police say a woman was killed and at least 16 other people were wounded by a homemade bomb inside a bus in a southern Philippine city where Abu Sayyaf militants are known to operate.

Zamboanga City police Chief Inspector Joel Tuttuh said the bomb exploded Friday under a seat in the middle of the vehicle, which was loading passengers at a bus terminal near a market.

He says there were no immediate suspects, but they could include the militants, who set off a car bomb in Zamboanga earlier this year near another bus terminal, killing two people and wounding more than 50 others.

Tuttuh says of at least one of those wounded in Friday's blast was in serious condition after losing an arm and a leg.