American troops killed four suspected Taliban members in a three-hour gun battle on the Pakistani border, a military spokesman said today. The soldiers were on patrol when they came under attack shortly before dawn today, Col. Rodney Davis said. There were no American casualties. The troops came under attack near Shkin in southeastern Afghanistan, a border area where there have been frequent raids by militants crossing over from Pakistan. One American soldier was killed in a similar attack in December and two more died when troops walked into a daylight ambush near Shkin in April. This time, an unknown number of attackers fired rocket-propelled grenades and assault rifles at the Americans. They responded with artillery rounds. Later, as they searched the area, they found three dead guerrillas; they shot and killed a fourth when he tried to throw a grenade at them. Full Story