Islamabad: Three ISI operatives agency were killed and one more injured in an attack by suspected Taliban fighters in Pakistan's restive northwest on Wednesday, media reports said.

The militants ambushed a vehicle with the Inter-Services Intelligence officials in Bannu area of Khyber-Pakhtunkhwa province.

The militants, armed with assault rifles, fired at the car from several directions.

Three officials were killed instantly, the reports said.

The media reports described the dead intelligence operatives as low-ranking officials of the ISI.

There was no official word on the incident from the military. This was the second major attack since Tuesday blamed on the Pakistani Taliban, who have targeted military and intelligence facilities in suicide attacks and bombings over the past four years.

Among the military facilities attacked by militants are the army’s General Headquarters in Rawalpindi and a naval airbase in Karachi.

On Tuesday, the Taliban attacked a school van on the outskirts of Peshawar city, killing five children and the driver.

 A militant spokesman said the attack was directed against members of a pro-government tribe.