Israeli forces killed two more Palestinian policemen in a fierce gun battle on Wednesday near a refugee camp in the Gaza Strip, bringing to four the number of Palestinians killed in the incident, hospital sources said. Two other policemen were killed earlier in the battle which raged for hours near the Khan Younis camp after an Israeli bulldozer guarded by soldiers tried to destroy an embankment used by Palestinian gunmen to shoot at a nearby Israeli army base and Jewish settlement. Palestinians said the embankment was on the edge of Palestinian-controlled territory and Israel had no right to enter the area. The deaths of the additional two members of the Palestinian National Security Forces brought to 317 the number of people killed in 11 weeks of violence between Palestinians and Israelis. More than 260 were Palestinians, 13 were Israeli Arabs and 38 were soldiers and other Israelis, Reuters reports.