Pakistani police officers, collect evidence from the site of a suicide bombing in Quetta, Pakistan, Sunday, Dec. 30, 2012. A suicide bomber driving a vehicle packed with explosives rammed into a bus carrying Shiite Muslim pilgrims in southwest Pakistan on Sunday, killing several people, a government official and eyewitnesses said. (AP Photo/Arshad Butt)

Associated Press
Pakistani police officers, collect evidence from the site of a suicide bombing in Quetta, Pakistan, Sunday, Dec. 30, 2012. A suicide bomber driving a vehicle packed with explosives rammed into a bus carrying Shiite Muslim pilgrims in southwest Pakistan on Sunday, killing several people, a government official and eyewitnesses said. (AP Photo/Arshad Butt)
Pakistani police officers, collect evidence from the site of a suicide bombing in Quetta, Pakistan, Sunday, Dec. 30, 2012. A suicide bomber driving a vehicle packed with explosives rammed into a bus carrying Shiite Muslim pilgrims in southwest Pakistan on Sunday, killing several people, a government official and eyewitnesses said. (AP Photo/Arshad Butt)
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