Associated Press
Pakistani volunteers carry an injured polio worker to a local hospital in Quetta, Pakistan, Wednesday, Nov. 26, 2014. Gunmen attacked a polio vaccination team Wednesday, killing several health workers within hours a suspected U.S. drone strike killed four alleged militants in Pakistan, officials said. (AP Photo/Arshad Butt)

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A Taliban suicide bomber detonated a vehicle packed with explosives Monday outside the home of a senior police officer tasked with cracking down on militants in Pakistan's largest city.

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