Twin bombings in Pakistan's financial capital Karachi on Friday that killed at least 22 people were carried out by suicide bombers on motorcycles, a bomb disposal official said.
"Both of the blasts are of the same nature. Both were suicide and both were on motorcycles," the official, Munir Ahmad Sheikh, told private television channel Geo from Karachi.
"In the first attack, the bomber hit the bus. In the second attack, the bomber sitting on a motorcycle exploded himself," he added.