CAIRO (AFP) - Palestinian President Mahmud Abbas lashed out at his Hamas rivals on Sunday, as officials from Palestinian groups gathered in Cairo amid hopes of bolstering a ceasefire in Gaza. Abbas accused the Hamas of putting the lives and aspirations of Palestinians at risk, at a press conference in Cairo, where he was to meet Egyptian President Hosni Mubarak on Monday. "They ... have taken risks with the blood of Palestinians, with their fate, and dreams and aspirations for an independent Palestinian state," he charged. He also accused Hamas of trying to destroy the Palestine Liberation Organisation and said he rejected dialogue with any group, which did not recognise the PLO. "Today they emerge upon us with a destructive project, which we have heard before ... and which has went to the rubbish bin of history," said the Western-backed Abbas, who is Palestinian Authority president. "They must admit clearly ... that the PLO is the sole legitimate representative of the Palestinian people and after that (there can be) dialogue," he said. A Hamas delegation was due to arrive in Cairo on Monday, to join a Gaza team already in the country, a Hamas official told AFP. An advisor to Ismail Haniya told AFP that the group was awaiting Israel's response to an Egyptian truce proposal. "We can speak with details about the truce after our delegation examines the Israeli response," said Ahmed Yusef, adding that Hamas expected the response by Monday. "But for now, things are moving in a positive direction."