JERUSALEM, July 10 (JTA) — Israeli security forces went on heightened alert Thursday following warnings of a possible terrorist attack in Israel. The alert also came as incidents of violence were reported throughout the West Bank. In one of the incidents, two border policemen were wounded, one of them moderately, in a roadside explosion on the outskirts of Nablus overnight. The bomb had been detonated by remote control near a border police jeep escorting a bus of students from the yeshiva at Joseph’s Tomb in the West Bank town. In Hebron, the head of the Israel Defense Force central command, Maj.-Gen. Uzi Dayan, ordered the closure of Palestinian shops after shots were fired at an apartment building in the Jewish quarter. No one was injured, but an inquiry found that a bullet had entered an apartment. Meanwhile, one Palestinian was reportedly wounded during demonstrations in the city on Thursday. Six gasoline bombs were thrown at Israeli security forces. Israelis troops dispersed the protesters with rubber bullets. No soldiers were reported injured.