Bomb blast rocks Karachi

Pakistani security officials and media persons gather at the site of bomb explosion in Karachi, Pakistan. AP

Pakistani volunteers carry an injured man at the site of explosion in Karachi, Pakistan. AP

Pakistani volunteer and soldier help an injured man at the site of explosion in Karachi, Pakistan. AP

Pakistani volunteers carry an injured man at the site of explosion in Karachi, Pakistan. AP

A Pakistani rescue worker and volunteers remove a dead body from the site of bomb explosion in Karachi, Pakistan. AP

Panicked people leave the site of bomb explosion in Karachi, Pakistan. AP

Pakistani volunteers look for victims amid of debris at the site of bomb explosion in Karachi, Pakistan. AP

Another shot of Pakistani volunteers looking for victims amid of debris at the site of bomb explosion in Karachi, Pakistan. AP

Injured people sit in an ambulance at the site of bomb explosion in Karachi, Pakistan. AP