Suicide blast kills 28 in Pakistan

A suicide bomber struck a night-time Shiite march in Pakistan, in the bloodiest attack of a day of violence that left at least 28 people dead
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Pakistani security officials comb the site of a bomb explosion near a Shiite Muslim mosque in Karachi on November 21, 2012. Militants hit Pakistani security forces on the eve of a major international summit, killing 10 people in regional flashpoints on Wednesday as delegates arrived in the capital Islamabad. The attacks were a reminder of the security challenges in a country that has been plagued by Taliban and Al-Qaeda-linked violence since the 9/11 attacks and comes during the holy month of Muharram, a magnet for sectarian attacks. (AFP/Getty Images)
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Pakistani security officials comb the site of a bomb explosion near a Shiite Muslim mosque in Karachi on November 21, 2012. Militants hit Pakistani security forces on the eve of a major international summit, killing 10 people in regional flashpoints on Wednesday as delegates arrived in the capital Islamabad. The attacks were a reminder of the security challenges in a country that has been plagued by Taliban and Al-Qaeda-linked violence since the 9/11 attacks and comes during the holy month of Muharram, a magnet for sectarian attacks. (AFP/Getty Images)
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Pakistani security officials comb the site of a bomb explosion near a Shiite Muslim mosque in Karachi on November 21, 2012. Militants hit Pakistani security forces on the eve of a major international summit, killing 10 people in regional flashpoints on Wednesday as delegates arrived in the capital Islamabad. The attacks were a reminder of the security challenges in a country that has been plagued by Taliban and Al-Qaeda-linked violence since the 9/11 attacks and comes during the holy month of Muharram, a magnet for sectarian attacks. (AFP/Getty Images)
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Pakistani Shiite Muslims mourn beside the body of a blast victim following an overnight suicide bomb attack on minority Shiite Muslims procession in Rawalpindi on November 22, 2012. A suicide bomber struck a night-time Shiite march in Pakistan, in the bloodiest attack of a day of violence that left at least 28 people dead as Islamic leaders gathered for a rare summit in Islamabad. Police in the garrison city of Rawalpindi near the capital said the attack on the procession of minority Shiite Muslims killed at least 16 people, after the suicide bomber blew himself up when he was stopped for a security check. (AFP/Getty Images)
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Local residents gather at the site of an overnight suicide bomb attack on minority Shiite Muslims procession in Rawalpindi on November 22, 2012. A suicide bomber struck a night-time Shiite march in Pakistan, in the bloodiest attack of a day of violence that left at least 28 people dead as Islamic leaders gathered for a rare summit in Islamabad. Police in the garrison city of Rawalpindi near the capital said the attack on the procession of minority Shiite Muslims killed at least 16 people, after the suicide bomber blew himself up when he was stopped for a security check. (AFP/Getty Images)
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Pakistani Shiite Muslims gather around victims a blast during a Shiite religious procession that left at least six people dead and several others injured in the city of Rawalpindi in Rawalpindi on November 22, 2012, in an attack by a suicide bomber. (AFP/Getty Images)
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Pakistani security officials comb the site of a bomb explosion near a Shiite Muslim mosque in Karachi on November 21, 2012. Militants hit Pakistani security forces on the eve of a major international summit, killing 10 people in regional flashpoints on Wednesday as delegates arrived in the capital Islamabad. The attacks were a reminder of the security challenges in a country that has been plagued by Taliban and Al-Qaeda-linked violence since the 9/11 attacks and comes during the holy month of Muharram, a magnet for sectarian attacks. (AFP/Getty Images)
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Pakistani policemen investigate the site where a bomb exploded during a Shiite religious procession that left at least six people dead and several others injured in the city of Rawalpindi in Rawalpindi on November 22, 2012, in an attack by a suicide bomber. (AFP/Getty Images)