Four firefighters die in garment factory blaze in Pakistan

The site of the fire in Karachi (Fareed Khan/AP)

Four firefighters died and nearly a dozen others were injured after a massive fire broke out in a garment factory in the southern Pakistan port city of Karachi, rescue officials and police said on Thursday.

The cause of the blaze, which ripped through the factory on Wednesday and eventually caused it to collapse, was not known, police said.