Men stand near blood stains after an explosion inside a madrasa in Karachi
Men stand near blood stains after an explosion inside a madrasa in Karachi April 28, 2014. At least three children were killed and several others wounded in the explosion in a madrasa situated inside the Jamia Masjid Tahiri mosque in Karachi's SITE area on Monday, local media reported. REUTER/Akhtar Soomro (PAKISTAN - Tags: EDUCATION RELIGION CIVIL UNREST)
Family members and rescue workers move the body of a student, who was killed in an explosion, in Karachi
Family members and rescue workers move the body of a student, who was killed in an explosion, near an ambulance outside a hospital morgue in Karachi April 28, 2014. At least three children were killed and several others wounded in the explosion in a madrasa situated inside the Jamia Masjid Tahiri mosque in Karachi's SITE area on Monday, local media reported. REUTER/Akhtar Soomro (PAKISTAN - Tags: EDUCATION RELIGION CIVIL UNREST)
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Four killed in Pakistan by bomb aimed at Shi'ites, say police
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A police man collects evidence as the resident gather at the site of an explosion at the Delhi Colony area, in Karachi
A police man collects evidence as the resident gather at the site of an explosion at the Delhi Colony area, in Karachi April 25, 2014. At least four people were killed and around thirty others wounded after a bomb exploded near a government vehicle in Pakistan's southern city of Karachi on Friday, police and hospital officials said. REUTERS/Athar Hussain (PAKISTAN - Tags: POLITICS CIVIL UNREST CRIME LAW)
A man, who was injured in a bomb explosion in the Delhi Colony area, lies on a stretcher after he was brought to a hospital for treatment in Karachi
A man, who was injured in a bomb explosion in the Delhi Colony area, lies on a stretcher after he was brought to a hospital for treatment in Karachi April 25, 2014. At least four people were killed and around thirty others wounded after a bomb exploded near a government vehicle in Pakistan's southern city of Karachi on Friday, police and hospital officials said. REUTERS/Akhtar Soomro (PAKISTAN - Tags: POLITICS CIVIL UNREST CRIME LAW)
Security officials hold weapons as they secure the site of an explosion at the Delhi Colony area, in Karachi
Security officials hold weapons as they secure the site of an explosion at the Delhi Colony area, in Karachi April 25, 2014. At least four people were killed and around thirty others wounded after a bomb exploded near a government vehicle in Pakistan's southern city of Karachi on Friday, police and hospital officials said. REUTERS/Athar Hussain (PAKISTAN - Tags: POLITICS CIVIL UNREST CRIME LAW)
A police official surveys the site of an explosion in Karachi
A woman police official (L) surveys the site of an explosion at the Delhi Colony area, in Karachi April 25, 2014. At least four people were killed and around thirty others wounded after a bomb exploded near a government vehicle in Pakistan's southern city of Karachi on Friday, police and hospital officials said. REUTERS/Athar Hussain (PAKISTAN - Tags: POLITICS CIVIL UNREST CRIME LAW)
A policeman instructs people to move away from the site of an explosion at the Delhi Colony area, in Karachi
REFILE - ADDITIONAL CAPTION INFORMATION A policeman instructs people to move away from the site of an explosion at the Delhi Colony area, in Karachi April 25, 2014. At least four people were killed and around thirty others wounded after a bomb exploded near a government vehicle in Pakistan's southern city of Karachi on Friday, police and hospital officials said. REUTERS/Athar Hussain (PAKISTAN - Tags: POLITICS CIVIL UNREST CRIME LAW)
A policeman instructs people to move away from the site of an explosion in Karachi
A policeman instructs people to move away from the site of an explosion in Karachi April 25, 2014. At least four people were killed, and 30 injured in an explosion on Friday near a mosque in the Delhi colony area of Karachi, local media reported. REUTERS/Athar Hussain (PAKISTAN - Tags: POLITICS CIVIL UNREST CRIME LAW)