By Nidal al-Mughrabi CAIRO, June 15 (Reuters) - Israeli strikes and gunfire killed at least four Palestinians in Gaza on Monday, health officials said, as mediators prepared for further ceasefire talks in Cairo to safeguard a U.S.-brokered peace plan for the tiny war-ravaged Palestinian enclave. Medics said an Israeli airstrike killed a woman in the town of Zawayda in the central Gaza Strip, while another strike killed one person in the nearby Nuseirat refugee camp.
