Firemen try to extinguish a fire following a blast in Karachi, Pakistan, 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 leaving many injured. Authorities were trying to determine whether the explosion was caused by a bomb or a gas cylinder, said a police spokesman. (AP Photo/Fareed Khan)

Associated Press
Firemen try to extinguish a fire following a blast in Karachi, Pakistan, 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 leaving many injured. Authorities were trying to determine whether the explosion was caused by a bomb or a gas cylinder, said a police spokesman. (AP Photo/Fareed Khan)
Firemen try to extinguish a fire following a blast in Karachi, Pakistan, 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 leaving many injured. Authorities were trying to determine whether the explosion was caused by a bomb or a gas cylinder, said a police spokesman. (AP Photo/Fareed Khan)
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