A man Wednesday hurled a grenade at a NATO supply truck carrying machinery destined for Afghanistan, damaging the equipment in Quetta, police said. The attacker threw the hand grenade as trucks loaded with supplies waited for customs clearance near the Chaman border crossing in southwestern Baluchistan province, local police officer Gul Mohammad said. "Soon after the grenade blast people saw a man fleeing the area and (he) disappeared in the rush," he said, quoting witnesses. The truck was carrying a machine for drilling wells. The blast caused "minor damage" to the machine and no casualties, the officer said. The crossing was briefly closed to trucks after the attack, for which nobody has claimed responsibility. NATO and US-led forces in landlocked Afghanistan are hugely dependent on Pakistan for supplies and equipment, about 80 percent of which is transported through the troubled country.