Israeli troops hunting nationalist fighters raided a West Bank hospital on Monday, and Palestinian witnesses reported exchanges of fire in the area. In the Gaza Strip, three Palestinians were killed by army fire, including two fighters and a civilian who stood at the gate of the school when he was hit. In the West Bank raid, dozens of Israeli armored vehicle entered the town of Jenin and the adjacent refugee camp by the same name before dawn Monday. Witnesses said soldiers took over several buildings, including a school and a government office, and exchanged fire with gunmen. Three Palestinians were wounded, hospital officials said.