At least four people were killed and 30 others injured when two bomb went off near an office of the Muttahida Qaumi Movement in Karachi, the latest in a string of attacks by the Taliban targeting liberal political parties ahead of the May 11 polls.

The blasts occurred in Aziz Abad area of Karachi and near the MQM office close to the central headquarters of the party. 

Police and Rescue officials said that the blasts had left four people dead and around 30 were injured who were being rushed to hospital. 

"The intensity of the first blast was stronger than the second one which took place few minutes later," SSP Imran Shaukat said.

He said that the election office of the party was the apparent target of the two separate blasts which took place near Lal Qila ground where the party holds frequent rallies. This is the sixth time in the last two weeks that bomb attacks have been carried out close to MQM election/sector offices in Pakistan's biggest city.