Police say there has been no immediate claim of responsibility for the explosion in Quetta, the capital of the oil and gas-rich province of Baluchistan, which borders Afghanistan and Iran.
Blast in Southwestern Pakistan Wounds 13

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Residents stand among rubble and debris at the site of a bomb attack in Quetta, Pakistan, April 24, 2013.

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Rescue workers move a wounded man after a bomb attack in Quetta, Pakistan, April 24, 2013.

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A security official shows a grenade found at the site of a bomb attack in Quetta, Pakistan, April 24, 2013.

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A shopkeeper sits outside his shop, after it was damaged by a bomb attack in Quetta, Pakistan, April 24, 2013.