Palestinian leader Mahmoud Abbas is due to meet Egypt's President Hosni Mubarak in Cairo, as part of efforts to bring about a long- term ceasefire in Gaza. Representatives from Hamas are also in Cairo, but Mr. Abbas has said talks were impossible with anyone who rejected the supremacy of the Palestine Liberation Organisation - in an apparent reference to Hamas's leadership. There has been a rift between Fatah and Hamas since Hamas took control of Gaza by force in mid-2007. Mr. Abbas has accused Hamas of having "taken risks with the blood of Palestinians, with their fate, and dreams and aspirations for an independent Palestinian state". The talks comes after Israeli aircraft bombed a Hamas security target in Gaza City and tunnels used by the militant group along the border with Egypt. There were no reports of casualties in Gaza following the attacks late on Sunday. Israel wants the rocket attacks to end and wants to prevent militants in Gaza from being able to rearm. Hamas wants the border crossings into Gaza to be fully opened to end 18-month blockade of Gaza. Both Israel and Hamas have independently declared ceasefires, but these have been violated several times.