Gunmen in Pakistan on Tuesday torched vehicles carrying supplies for Nato troops fighting the Taliban in neighbouring Afghanistan, in the second such attack in 24 hours, police said. The two tankers were attacked in Balochistan, the southwestern province that borders Iran and Afghanistan and is suffering a regional insurgency as well as violence by the Taliban. The attacks came a week after Pakistan reopened the main land border crossing used by Nato supply convoys, following an 11-day closure imposed after a cross-border Nato helicopter strike killed two Pakistani soldiers. Two men riding on a motorbike held up the trucks at gun point, forcing the drivers and their helpers to leave, police official Khuda Bakhsh said.