CAIRO (AFP) - Palestinian leader Mahmud Abbas met Egyptian President Hosni Mubarak on Monday as Cairo sought to mediate a lasting ceasefire in Gaza, where Hamas said it is willing to agree to a one-year truce. But deadly violence flared anew in the Palestinian enclave as Israel carried out a new air strike, killing one Palestinian and wounding four, in response to fresh fighters' rocket fire. "We agree in principle with a one-year truce," Hamas spokesman Fawzi Barhum told AFP in Gaza City ahead of the Cairo talks, but added that Hamas has not ruled out an 18-month truce proposed by the Egyptian mediators. "Whether one year or a year and a half, it must be linked to the opening of all crossing points, including Rafah, and the lifting of the (Israeli) blockade," Barhum said. Saudi Foreign Minister Prince Saud al-Faisal also attended the Mubarak-Abbas talks, which lasted two hours. Riyadh is a key force behind the Arab peace initiative to resolve the Israel-Palestinian conflict. But Cairo's task as mediator has been complicated by violations on both sides of the January 18 ceasefires and an escalating feud between the two main Palestinian factions. A Hamas delegation is due to meet Egypt's intelligence chief Omar Suleiman on Tuesday, Mussa Abu Marzuk, deputy head of Hamas's politburo, told AFP. Meanwhile, Israel carried out a deadly air raid in Gaza on Monday after warning of a harsh response to renewed fire from the enclave. One Palestinian was killed and four others wounded in the strike on a vehicle carrying fighters in the southern town of Rafah, medical sources and witnesses said. The dead man was identified as Ayman Abu Jazar of the Popular Resistance Committees, a small Palestinian armed group. Israeli Prime Minister Ehud Olmert vowed on Sunday to deal "a severe and disproportionate Israeli response" to new rocket fire. But the YNet News website quoted Defence Minister Ehud Barak as saying Israel had "no intention of embarking on Operation Cast Lead number two. We said there would be a response and we responded." Barak said that although most of the rockets were not fired by Hamas, the movement which has controlled Gaza since June 2007 bore responsibility for the attacks. "We know that most of the fire was not carried out by Hamas but by other small organisations, but Hamas is responsible. Hamas must act to stop this. "We need calm in the south, and that is the test... If there is no calm we will have to act again," Barak warned on public radio. The latest violence comes just over a week before Israelis go to the polls in a February 10 election expected to return the right-wing opposition to power. Meanwhile, Israeli soldiers shot dead a Palestinian gunman who opened fire on an army patrol in the south of the occupied West Bank, rescue services said. In Tehran, meanwhile, Hamas political supremo Khaled Meshaal urged Iranian students to join the movement in helping to liberate Jerusalem so they can "pray together" in the holy city. Meanwhile, foreign ministers of Arab states that back Palestinian President Mahmud Abbas are to meet in Abu Dhabi on Tuesday to discuss Palestinian unity amid continued factional infighting, a diplomatic source said. Among those attending the meeting will be Saudi Foreign Minister Prince Saud al-Faisal and his Egyptian counterpart, Ahmed Abul Gheit, the source said, adding that Abbas is also expected. "In all, 10 countries will be represented at the Abu Dhabi meeting," the source said, declining to name them. According to Saudi-sponsored Al-Arabiya television, which broadcasts from Dubai, other countries sending representatives to the meeting include the United Arab Emirates, Jordan, Kuwait, Tunisia and Morocco.