(Updates casualty toll) By Nidal al-Mughrabi GAZA, Feb 7 (Reuters) - Israeli troops backed by tanks, helicopter gunships and warplanes killed seven Palestinian militants and a schoolteacher in a raid in the Hamas-ruled Gaza Strip on Thursday, militant groups and hospital officials said. Israel has stepped up military action against Hamas since it claimed responsibility for a suicide bombing on Monday, the first such attack by the Islamist faction inside the Jewish state since 2004. Residents said tanks and heavy bulldozers penetrated the border fence near the northern town of Jabalya. Israeli forces also struck in nearby Beit Hanoun, a border community often used by Palestinian militants to fire rockets into Israel. Hamas, the ruling Islamist group, said six of its gunmen were killed in the violence. Another gunman, from Islamic Jihad, also died in the clashes, it said. An Israeli missile hit a school in Beit Hanoun, killing a teacher and wounding three pupils, hospital officials said. Two of the wounded were initially identified as fellow staff members but the Education Ministry later said all three were pupils aged 16. "What was the fault of a teacher, an emissary on a sacred mission?" the ministry said in a statement deploring the attack. An Israeli military spokeswoman said troops had fired on a Palestinian rocket crew spotted inside Beit Hanoun. "We certainly did not target a school," she said. An investigation is under way to determine whether the building might have been hit by a stray missile. The military spokeswoman confirmed there had been an incursion in Jabalya and said forces withdrew after a few hours. ROCKET FIRE In the West Bank city of Ramallah, the executive committee of the Palestine Liberation Organisation called on Israel to stop "operations of killing and destruction ... including aggression against houses and schools". After a meeting chaired by Palestinian President Mahmoud Abbas, the committee issued a statement expressing its opposition to rocket fire on Israel and other attacks on Israeli civilians. It said the violence hurt the Palestinian cause. Israel quit Gaza in 2005 after 38 years of occupation but still controls its coast, key crossings and airspace. Hamas and other factions regularly launch crude rockets across the border. "If rocket fire from Gaza continues we will intensify our operations ... until the salvoes end," Israeli Defence Minister Ehud Barak said in remarks aired by Army Radio. Seven rockets were launched from Gaza on Thursday, the army said. One hit the border town of Sderot, hurting two Israelis. Hamas seized control of the Gaza Strip in June when it routed secular Fatah forces loyal to Palestinian President Mahmoud Abbas, who has revived peace talks with Israel. Hamas refuses to give up its fight against the Jewish state. (Additional reporting by Joseph Nasr in Jerusalem and Mohammed Assadi in Ramallah, Writing by Dan Williams, Editing by Matthew Tostevin)
Palestinians carry the body of Hamas militant Mohammed Abu Sadah during his funeral in the southern Gaza Strip February 6, 2008. Israeli forces killed nine Hamas militants in the Gaza Strip ...