Associated Press
FILE - In this Saturday, April 28, 2012, file photo,Pakistanis use a cart to carry the lifeless body of a civilian away from the site of fighting, during a crackdown operation by Pakistani police commandos 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/Fareed Khan, 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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