Bomb explodes on Philippine bus

At least five people have been killed and a further five injured when a bomb exploded on a bus in the southern Philippines, police said.

The blast was one of two bombs on the island of Mindanao, targeting vehicles run by the Weena Bus Company.

The second blast caused no injuries, because the vehicle was empty when the explosion was detonated.

Police said the motive was unclear, but added that the company had recently been targeted by criminal groups.

"We're looking at a number of motives behind the attack," police chief Andres Caro said.

"One is the terrorism angle, another is a management problem, a third is possible extortion."

On 18 May a bomb exploded on another bus owned by the company.

It was detonated at a bus terminal in the southern city of Cotabato, leaving three people dead and wounding 15 others.