GAZA, June 6 (Xinhua) -- Israeli Apache attack helicopters launched before midnight Tuesday an airstrike at a training military camp that belongs to the popular resistance committees in Gaza city, security sources and witnesses reported.

    According to witnesses, the helicopters that hovered low have fired at the camp, which was empty on that time.

    There were no reports of casualties in the air strike that targeted the camp for second time in two months.

    The earlier strike killed four Popular Resistance Committees (PRC) militants who were training in the camp located in southern Gaza City.

    The strike came hours after the PRC and the Islamic Jihad's armed wing announced responsibility for firing Russian-made Katyusha rocket at an Israeli community in a development seen by Israel as unprecedented.

    On Tuesday morning, two rockets fired by Palestinian militants from the northern Gaza Strip hit the southern Israeli city of Sderot, slightly wounding one Israeli woman.

    In response, the Israeli army shelled the suspected rocket launching sites in the Gaza Strip.

    Israel's defense establishment on Tuesday accused Palestinian ruling Islamic Resistance Movement (Hamas) of directly involving in the Qassam attacks.

    In response to the reported Hamas involvement in the rocket fire, Israeli Defense Minister Amir Peretz has threatened to "hunt down the Qassam gunners" and increase IDF retaliatory measures ,according to Israeli newspaper Ha'aretz.

    Peretz was also cited as saying that Israeli army would start targeting Hamas if it would not reign in its members who were behind the rocket attacks. Enditem