Pakistan blocked a major fuel supply route for Western forces in Afghanistan on Saturday in response to a raid by U.S. forces into northwest Pakistan this week, REUTERS quoted the defence minister as saying. U.S. commandos attacked suspected militants inside Pakistani territory on Wednesday, killing 20 people including women and children, Pakistani officials said, and drawing a furious response from the Pakistani government. "We have told them that we will take action and we have already taken action today. We have stopped the supply of oil and this will tell how serious we are," Defence Minister Chaudhry Ahmed Mukhtar told Dawn Television. Fuel supplies have been blocked from crossing through the main crossing point at Torkham on the Pakistani-Afghan border near Peshawar, capital of North West Frontier Province. Earlier, an official in the northwest said the fuel was being stopped temporarily because of worries about security on the Pakistani side. Militants have been attacking trucks in the Khyber Pass, on the way to Torkham.