Palestinian leaders yesterday accused the Israelis of destroying the peace process and called on the US to denounce Prime Minister Benjamin Netanyahu. Mr Netanyahu said his concerns for the security of Israel meant he could not give any further ground to the Palestinians, leaving diplomats pessimistic that an agreement would be reached. Israeli and Palestinian delegations trooped across London, holding separate meetings with British Prime Minister Tony Blair and US Secretary of State Madeleine Albright. With little prospect of progress, speculation grew that Ms Albright was losing patience with Mr Netanyahu for refusing to accept US proposals for a troop withdrawal from the West Bank. After the two had discussed the issue for nearly five hours, Ms Albright's spokesman had to admit there was 'no compelling evidence that the meetings will yield a breakthrough'. But James Rubin added she was likely to stay on in London rather than leave last night as originally planned. Ms Albright was determined to do what she could to break the impasse in peace negotiations and believed the London meetings to be 'decisive', Mr Rubin said. Speaking after talks earlier with Mr Blair, Mr Netanyahu said: 'We have gone the extra mile, well beyond the extra mile. We need some similar corollary efforts from the Palestinians and hope that will be forthcoming.' The United States has been pressing for Israeli troops to withdraw from a further 13 per cent of the West Bank under a deal reluctantly accepted by Palestinian Authority President Yasser Arafat. Netanyahu spokesman David Bar-Illan warned against expecting Israel's agreement. 'To talk about a breakthrough would be an exaggeration of expectations. We are talking about the destinies of two people,' he said. After his meeting with Mr Blair, Mr Arafat said it was time Mr Netanyahu made a positive move. Chief Palestinian negotiator Saeb Erekat was more forthright: 'We want the Americans, if they cannot get a yes from Netanyahu, to introduce the proposals on the table officially and publicly and let the world know that today there is a government in Israel that is determined to torpedo the peace process.' The peace process has been blocked for 13 months.