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Pakistani volunteers carry a wounded passenger following a blast in Karachi, Pakistan on Saturday, Dec. 29, 2012. The blast that ripped through the bus set the vehicle on fire and reduced it to little more than a charred skeleton, killing scores of people and left many injured. Police were trying to determine whether the explosion was caused by a bomb or a gas cylinder, said police spokesman. Many buses in Pakistan run on natural gas. (AP Photo/Fareed Khan)

Associated Press
Pakistani volunteers carry a wounded passenger following a blast in Karachi, Pakistan on Saturday, Dec. 29, 2012. The blast that ripped through the bus  set the vehicle on fire and reduced it to little more than a charred skeleton, killing scores of people and left many injured. Police were trying to determine whether the explosion was caused by a bomb or a gas cylinder, said police spokesman. Many buses in Pakistan run on natural gas. (AP Photo/Fareed Khan)
Pakistani volunteers carry a wounded passenger following a blast in Karachi, Pakistan on Saturday, Dec. 29, 2012. The blast that ripped through the bus set the vehicle on fire and reduced it to little more than a charred skeleton, killing scores of people and left many injured. Police were trying to determine whether the explosion was caused by a bomb or a gas cylinder, said police spokesman. Many buses in Pakistan run on natural gas. (AP Photo/Fareed Khan)
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