Just hours after the White House formally announced that President George W. Bush would meet with Prime Minister Ariel Sharon and Palestinian Prime Minister Mahmoud Abbas next Wednesday, the two prime minsters confirmed they would meet for the second time since Abbas formed a government, at an undisclosed location tonight.

Abbas is bringing his minister for security, Mohammed Dahlan, and his minister for external relations, Nabil Sha'ath, to tonight's mini-summit, while Sharon is expected to be accompanied by advisors and aides. The venue was being kept secret until the last minute for security reasons, said government sources.

Sharon is expected to tell Abbas that since Israel has accepted the road map, it is now the Palestinians' turn to start implementing security measures against terrorism. Abbas is expected to reply that the Palestinians have already begun implementing the road map by forming new Palestinian institutions and appointing a new Palestinian government, so Israel should begin taking the steps outlined in the road map.

Formally, the road map process is supposed to begin with a joint statement reaffirming the principles of the road map, and the Bush summit appears to be aiming for just such a statement.

Government sources said the prime minister is very eager for tonight's meeting to be successful, as part of the groundwork ahead of the meeting with Bush next week. Sharon is expected to propose that the Palestinian government take gradual charge of areas Israel withdraws from in Gaza and West Bank cities.

Israel will demand "100 percent effort" against terror in those areas, including arrests, interrogations and trials for terrorists and their commanders; dismantling the terror organizations; collecting illegal weapons; preventive measures to foil attacks; security cooperation and coordination with Israel and an end to incitement against Israel in the Palestinian media and schools.

Sharon is also expected to tell Abbas that Israel is reinstating several humanitarian gestures that were announced two weeks ago but were frozen after a spate of terror attacks that left 12 Israelis dead.

Security sources said that Israel also is awaiting a security plan being devised by Dahlan and clarifications as to how he intends to take over areas that the IDF leaves. Dahlan's meeting three weeks ago with the outgoing government coordinator in the territories, Maj. Gen. Amos Gilad, was not successful.

Abbas is expected to brief Sharon on a deal the Palestinian premier has worked out with the Hamas for a temporary cease-fire. He will ask Sharon to suspend offensive operations against the Palestinians, to halt assassinations and to release Palestinian prisoners. He will also seek clarifications from Sharon about a timetable for Israeli moves to implement the road map, including when Israel plans to begin dismantling outposts established after March 21, 2001, and a construction freeze in the settlements. Washington, meanwhile, is seeking Israeli confidence-building measures such as prisoner releases.