MANILA, Aug 3 (Reuters) - Two crude bombs ripped through a commuter bus at a terminal in southern Philippines on Friday, killing one and wounding an undetermined number, police said.

Robert Kuinisala, police chief in South Cotabato province, said a man was killed instantly when the first device exploded at about 5:30 p.m. [0930 GMT] at a bus terminal in Koronadal City.

Minutes later, a second bomb exploded inside a commuter bus parked at the same terminal, Kuinisala added.

"We've sent some people to investigate the explosions," he said, adding a group engaged in extortion activities could be behind the attacks.

"The bus company got telephone calls early in the day from a group called al-Khobar demanding protection money."

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