MANILA: A homemade bomb exploding under a bus seat killed an 11-year-old girl and wounded 32 other people Friday in a southern Philippine city where Abu Sayyaf militants operate, police said.

The bomb exploded in the middle of the vehicle as it was loading passengers at a bus terminal near a market, said Zamboanga City police Chief Inspector Joel Tuttuh. He said the suspects weren’t known but 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.

Vice Mayor Cesar Itturalde said a closed circuit television camera caught the image of a possible suspect — a man carrying a bag approaching the bus and minutes later leaving the scene with nothing in his hands and running away before the explosion. He said the man wore a hoodie jacket and covered his mouth with a handkerchief. Tuttuh said at least one of those wounded in Friday’s blast was in serious condition after losing an arm and a leg.

“The (improvised explosive device) could have come from the Abu Sayyaf, disgruntled employees or competitors,” he said by telephone from Zamboanga.