KARACHI - The charred bodies of seven Karachi airport workers who phoned their families as they hid in a cold-storage facility that was engulfed in flames during a Taliban attack were recovered by the authorities Tuesday.

The deaths of the workers bring the toll from Monday’s all-night siege to 37. The victims’ families had staged a protest on a main road in Monday night, demanding the authorities find their relatives, saying they had been in contact via telephone during the attack.

The assault extinguished a nascent peace process and raised questions about how the Taliban were able to penetrate the airport serving Pakistan’s economic hub. “We have recovered seven dead bodies from the cold storage that was on fire,” Sindh Health Minister Dr Sagheer Ahmed told reporters, adding one airport security guard remained missing.

The cold-storage facilities, which are normally kept at freezing point and are used to keep food, had lost power at the time of the attack, he said.  The facilities were adjacent to a hajj terminal that was one of the entry points used by the militants and caught fire during the assault.

Eleven Airport Security Force officials, a paramilitary ranger, a policeman, 14 civilian workers and 10 militants have been confirmed dead.

It is now the biggest Taliban attack since a car bomb killed at least 42 people in the busy Qissa Khwani market of Peshawar in September 2013.

The latest attack took place just three kilometres (two miles) from Karachi’s Mehran naval base, which the Taliban besieged three years ago, destroying two US-made Orion aircraft and killing 10 personnel in a 17-hour operation.

The group also carried out a raid on Pakistan’s military headquarters in the garrison city of Rawalpindi in 2009, leaving 23 dead, including 11 troops and three hostages.