WANA: Security forces arrested 15 suspected militants, including Afghans, and confiscated two trucks packed with explosives in the South Waziristan tribal region on the Afghan border, local military officials said.

The explosives were destined for Pakistan’s biggest city and commercial hub Karachi, the officials said.

Karachi is currently undergoing its worst violent unrest in 16 years, with more than 100 people killed in one week alone last month.

Earlier, a car-borne Taliban suicide bomber flattened the house of a senior counter-terrorism police official in Karachi on Monday, killing eight people including six policemen.

Senior Superintendent Aslam Khan, who was unhurt in the attack but whose home was destroyed, said he had been threatened by the Pakistani Taliban and knew that he was the target.

Khan heads the counter-terrorism unit of the Police Crime Investigation Department in Karachi, investigating Islamist militant cells in the port city of 18 million people.