From BBC News
At least 25 people have been killed by a bomb explosion in the Pakistani city of Karachi, police say.
The blast in the mainly Shia Muslim area of Abbas town destroyed several buildings and set others on fire. Some reports spoke of a second explosion.
Rescuers have been struggling to reach people thought to be trapped under the rubble.
Pakistan’s Shia minority are the target of frequent sectarian attacks from Sunni militant groups.
The explosion sent a huge column of smoke into the sky above Karachi and caused a power cut in part of the city.
Residents have been using car headlights to help rescuers search for survivors, local media reports said.
More than 50 people were injured, and there are fears the number of dead will rise.
