There was no immediate claim of responsibility.
Twin explosions killed at least 10 people and wounded more than a dozen soldiers in a town on a restive island in the southern Philippines on Monday, media and a military source said.
One blast took place around noon and another followed about an hour later in Jolo, the main town on Jolo island, a militarised stonghold of the Abu Sayyaf, a militant group that has pledged allegiance to Daesh.
An initial military report said one of the blasts was cased by a homemade bomb on a motorcycle, said an army source, who could not be named because he was not authorised to speak to media. The source said 17 soldiers were wounded.
ABS-CBN news reported that the blasts took place in two separate locations, one of which was close to military vehicles. There was no immediate claim of responsibility.
