HEBRON, West Bank -- Palestinian gunmen killed an Israeli hitchhiker and wounded two others in a drive-by shooting Friday in the West Bank, the army said. An upsurge in Israeli-Palestinian violence is threatening a truce reached in February and highlights the difficulties Palestinian leader Mahmoud Abbas faces in reining in militant groups. Gunmen shot a group of hitchhikers as they were getting into a car near Beit Haggai, a Jewish settlement just south of the West Bank city of Hebron, the army said. A teenage hitchhiker was killed and two others were wounded, one of them critically, the army said.