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over the RAMALLAH, West Bank (AP) - Palestinian leader Yasser Arafat (news - web sites) rebuffed Secretary of State Colin Powell (news - web sites)s demand Sunday for a halt to violence, aphorism Israel first must withdraw its troops from the West Bank.Photos AP Photo Slideshows AP Photo Mideast Conflict Audio/Video Powell to Meet With Arafat Sunday (AP) Powell, shuttling back to Israel for a skirmish in Tel Aviv, then pressed Prime Minister Ariel Sharon (news - web sites) for a complete pullback, a U.S. official state.Sharon renewed his proposal for an international peace assemblage among Israel and Arab states including Saudi Arabia, Syria and Lebanon and the Palestinians, but not Yasser Arafat.Sharon said the United States would lead the conference, and "I imagine that within a short time a conference of this sorting will convene to debate the diplomatic arrangements in the Middle East."Palestinian negotiator Saeb Erekat said the proposal was an attempt to "turn t he clock backward."A precedential U.S. official said the idea was discussed "as part of a way to move forward politically," but more talks were needed.Arafat, 72, appeared in good wellness as he met with Powell in his rocket-scarred headquarters that is surrounded by Israeli tanks and troops. Arafat has been under pressure that is "unreal for an old man like him," said Zeid Abu Shawish, a Palestinian doctor in the compound.Powell was driven to the besieged compound in a motmorcade of armored-plated SUVs, shielded by U.S. security personnel with submachine guns.The headquarters showed the effects of Israeli bombardment. A gaping hole marred the facade and the walls were blackened with bullet marks.A senior aide, Saeb Erekat, said Arafat stood by his commitments, including an end to violence. But, Erekat said after the three-hour meeting, that meant " erst the Israelis complete the withdrawal we will, as Palestinians, then carry out our obligations."Arafat complained bitterly and extensively to Powell about Israels military thrust into Palestinian-held towns and villages, and especially its actions in Jenin and a refugee camping ground in the town.President Bush (news - web sites) has demanded a pullback right away, but Sharon refused to provide a timetable when he saw Powell on Friday in Jerusalem. They met again briefly Sunday night in Tel Aviv.Powell, in a short statement to reporters, called his meeting with Arafat useful and constructive.A senior U.S. official said Powells " assort message" to Arafat in a 45-minute presentation was "the bombings have to stop, that it was a major barrier" to progress toward a security agreement or on negotiations that Powell has said should lead to establishment of a Palestinian state.