Aftermath of bus blast
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Pakistan bus explosion kills several in Karachi

29 December 2012 Last updated at 21:39 GMT

Several people have been killed by an explosion in a bus in Pakistan's southern city of Karachi.

It was parked at a terminal when the blast ripped through it.

The country's interior minister Rehman Malik said the explosion was caused by a bomb, as the BBC's Karin Giannone explains.