GAZA, Sept. 1 (Xinhuanet) -- Israeli Apache helicopters fired Wednesday night four missiles at the western part of Khan Younis refugee camp in the southern Gaza Strip, Palestinian witnesses andsecurity sources reported.

 ;   They said the helicopters hovered over Khan Younis and then suddenly fired four missiles at a crowd of people at al Namsawi neighborhood in western part of Khan Younis refugee camp.

    Medical sources said at least six Palestinian civilians were injured and taken to Nasser Hospital in the town.

    The residents said that several Israeli army tanks, bulldozers and armor personnel carriers raided the area close to al Namsawi neighborhood and reached the main grave yard of the area.

    Palestinian security sources said they expected a widespread Israeli military operation in the western area of Kahn Younis after Palestinian militants intensified firing homemade rockets and mortars at the nearby Jewish settlements.

    Meanwhile, an Israeli army force backed by about 20 tanks stormed on Wednesday night the West Bank town of Ramallah, where soldiers raided a building in the center of the town, Palestinian security sources reported.

    The sources said that Israeli troops raided the building of Cairo-Amman Bank al Manara square in the heart of Ramallah and detained two Palestinian in the building.

    Residents said that Israeli soldiers had opened fire during the raid on the town, adding that two Palestinians were injured and taken to Ramallah hospital for treatment.

    Palestinian leader Yasser Arafat's headquarters, better known asal Muqata, is in Ramallah, where he has been under the Israeli siege for almost three years.

    Palestinian security sources said that they have concerns that Israel may hurt Arafat in revenge for the two suicide bombing attacks carried out on Tuesday in Beer Sheva in southern Israel, killing at least 16 Israelis. Enditem