Bomb blast kills dozens in Pakistan

Associated Press
Pakistani medics and civilians gather at the site of a bomb blast in Karachi, Pakistan, Sunday, March 3, 2013. Pakistani officials say a bomb blast has killed dozens of people in a neighborhood dominated by Shiite Muslims in the southern city of Karachi. (AP Photo/Fareed Khan)

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A suspected suicide bomber attacked Shi'ite Muslims as they were leaving a mosque in Pakistan's commercial capital on Sunday, killing at least 45 people, in another signal Sunni militants are escalating sectarian attacks.

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