The Palestinian leadership, in unusually harsh criticism of Washington, on Tuesday held the United States responsible for "racist" Israeli policies it said had sabotaged the peace process.

The leadership said recent developments had confirmed the need for the Palestinians to go to the UN General Assembly in September to seek international recognition for a Palestinian state within the 1967 lines.

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Obstinacy Officials: PA prevented Quartet statement Attila Somfalvi Israeli sources say Palestinians objected to Quartet's call to halt push for September declaration Officials: PA prevented Quartet statement

The Palestine Liberation Organization's (PLO) Executive Committee convened in the West Bank city of Ramallah, after a meeting in Washington of the Quartet of Middle East peace mediators on Monday failed to announce any progress towards reviving peace talks.

The Quartet comprises the United States, Russia, the European Union and the United Nations.

The PLO said Israeli Prime Minister Benjamin Netanyahu's government aimed to prevent any resumption of negotiations and the establishment of an independent Palestinian state.

"The only option facing the world today, especially the United States, is to use all tools to oblige the occupiers to halt their racist, expansionary policy," the PLO said in a statement released after its meeting.

"The United States bears the prime responsibility for the continuation of this racist (Israeli) policy," it said.

Palestinian President Mahmoud Abbas has said the Palestinians will seek international recognition for Palestinian statehood at the UN General Assembly if there is no resumption of peace talks by September.

The United States has said it will oppose any Palestinian attempt to secure full membership of the United Nations at the September meeting. It describes it as a unilateral step that will have no more than symbolic value.

Israeli officials worry it is part of a new Palestinian strategy aimed at isolating and "delegitimizing" Israel.

US President Barack Obama's efforts to revive the two-decade old Middle East peace process were derailed last year when face-to-face negotiations were halted by a dispute over Israeli settlement expansion in the West Bank.

Netanyahu said on Monday he was willing to sit down with Abbas "to open direct negotiations, but regrettably they refuse", according to a statement issued by his office.