Associated Press
FILE - In this Friday, April 27, 2012, file photo, Officers of Pakistani law enforcing agency escort an alleged criminal during a crackdown operation against criminals in Karachi's town of Lyari, Pakistan. Over 2,000 people were murdered in Pakistan's largest city last year, but the shooting death of 20-year-old Shahzeb Khan in one of Karachi's most upscale neighborhoods sparked an unusual outcry and highlighted a growing trend of citizens using social media to hold the country's rich and powerful to account. (AP Photo/Shakil Adil, File)

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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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