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
![Residents stand among rubble and debris at the site of a bomb attack in Quetta, Pakistan, April 24, 2013.](https://gdb.voanews.com/906d0423-c315-4c8e-af4d-878c8ee4785b_w1024_q10_s.jpg)
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Residents stand among rubble and debris at the site of a bomb attack in Quetta, Pakistan, April 24, 2013.
![Rescue workers move a wounded man after a bomb attack in Quetta, Pakistan, April 24, 2013.](https://gdb.voanews.com/be1d220d-da47-4a56-96a1-7b0ff9406126_w1024_q10_s.jpg)
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Rescue workers move a wounded man after a bomb attack in Quetta, Pakistan, April 24, 2013.
![A security official shows a grenade found at the site of a bomb attack in Quetta, Pakistan, April 24, 2013.](https://gdb.voanews.com/2f94e44d-49c8-4631-b213-f89a59fba4e0_w1024_q10_s.jpg)
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A security official shows a grenade found at the site of a bomb attack in Quetta, Pakistan, April 24, 2013.
![A shopkeeper sits outside his shop, after it was damaged by a bomb attack in Quetta, Pakistan, April 24, 2013.](https://gdb.voanews.com/5c0d3c00-63e2-483c-bc1d-5c09dc2f11b8_w1024_q10_s.jpg)
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A shopkeeper sits outside his shop, after it was damaged by a bomb attack in Quetta, Pakistan, April 24, 2013.