Blast strikes naval bus in Karachi, Pakistan

The attack took place in the early hours of Thursday morning in the Karsaz area of the city. Only two days ago, Taliban militants attacked two buses carrying Pakistani naval staff, leaving four people dead and 56 wounded.

The militants warned that further attacks would follow.

Sharfuddin Memon, a spokesman for the Sindh provincial government, said the bomb was detonated on the roadside as the bus, packed with navy officials, passed by.

"We have reports that 15 people have been injured," said Memom.

Police officials at the scene say they suspect the bomb was planted in a motorbike found near the blast site.

The BBC reports that according to police sources, that the vehicle was targeted as it left a naval facility in the city, which is the headquarters for the country's navy.

The source said the nature of the bombing "appears similar to the attack on two navy buses two days ago. But we will know for sure once the scene of the attack has been fully examined."

Witnesses said the force of the blast was such that the explosion was heard at least one kilometre away and it caused considerable damage to other nearby vehicles and a petrol station.