Palestinian terrorists shelled Israel from the Gaza Strip, breaching the almost week-old truce in the territory.

Islamic Jihad fired at least four rockets at Sderot on Tuesday, lightly wounding two residents.

The Palestinian faction described the salvo as retaliation for an Israeli raid in the West Bank which killed one of its local leaders there.

Hours earlier, unidentified Palestinians fired a mortar bomb from central Gaza into Israel, causing no casualties. The attacks were the first of their kind since Gaza's Hamas rulers and Israel entered an Egyptian-brokered truce last Thursday.

Israeli Prime Minister Ehud Olmert, fresh from talks with Egyptian President Hosni Mubarak in the Red Sea resort of Sharm e-Sheik, condemned the shelling as a "grave breach" of the cease-fire. Israel is "weighing a possible response," an aide quoted Olmert as saying

(c) JTA.