The car bomb on Sunday killed 45 people and wounded about 150 others outside a mosque.
Karachi Buries Bomb Victims
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Shi'ite Muslims attend funeral prayers who those killed in a bomb attack a day earlier in Karachi, Pakistan, March 4, 2013.
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Shi'ite Muslims shout slogans during a protest against the bomb attack in Karachi, in Quetta, Pakistan March 4, 2013.
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A man stands in an apartment that was damaged in a car bombing that killed scores of people, in Karachi, Pakistan, March 4, 2013.
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Medics and civilians gather at the site of a bomb blast in Karachi, Pakistan, March 3, 2013.