An explosion was heard at the hospital treating victims of a deadly bomb attack targeting a bus in Pakistan's financial capital, Karachi, which killed 22 people and wounded dozens more.
"In the first attack, the bomber hit the bus. In the second attack, the bomber sitting on a motorcycle exploded himself," he added.
Women and children were among those killed and wounded when the blast occurred on the last day of the holy Muslim month of Muharram, gutting the bus and flinging shards of glass across one of Karachi's busiest roads.
Witnesses and officials said the bus was packed with Shiite Muslims heading to a religious procession to mark the last day of Muharram in Karachi, a city of 16 million people with a sprawling port on the Arabian sea.
People look at dead bodies of bomb blast victims:
A girl cries over her dead mother at the scene of a bomb blast outside Jinnah hospital in Karachi February 5, 2010
Hospital staff assist a man injured by a bomb blast:
Pakistan's feared Taliban network claimed responsibility for that attack, sparking riots that caused huge financial losses.