Pakistani security officials inspect a damaged armoured police vehicle at the site of a suicide bomb attack in Karachi on April 5, 2012.—Photo by AFP

Hospital staff assist a man, injured in a bomb blast, after he was brought to the Jinnah hospital for treatment in Karachi April 5, 2012.—Photo by Reuters

A man injured in a bomb blast lies down next to a dead victim in an ambulance, as they are brought to the Jinnah hospital from the site in Karachi April 5, 2012—Photo by Reuters.

Pakistani security officials secure the area of a suicide attack in Karachi, Pakistan on Thursday, April 5, 2012. —Photo by AP

A Pakistani police officer searches the area after a suicide attack on Thursday, April 5, 2012. —Photo by AP

Pakistani paramilitary soldiers gather in the cordoned-off the site of a suicide bomb attack in Karachi on April 5, 2012. —Photo by AFP.