US blocks Palestinian leader from attending UN meeting in New York
US Secretary of State Marco Rubio blamed them for undermining peace efforts and for seeking "the unilateral recognition of a conjectural Palestinian state".
The decision, which has been welcomed by Israel, is unusual as the US is expected to facilitate travel for officials of all countries wishing to visit the UN headquarters.
The ban comes as France leads international efforts to recognise a state of Palestine at the session - a move Donald Trump's administration has opposed.
The Palestinian ambassador to the UN, Riyad Mansour, had earlier said that as head of its delegation, Abbas would be attending the meeting of heads of state and government in New York.
But a State Department official later said Abbas and about 80 other Palestinians would be affected by the decision to deny and revoke visas from members of the Palestine Liberation Organization (PLO) and the Palestinian Authority (PA).
Rubio said Palestinian representatives at the UN mission in New York could attend the meetings in accordance with the UN Headquarters Agreement - the document that regulates issues regarding the operations of the UN in the US.
It is unclear, however, if the US move to deny or revoke visas complies with that document, which outlines that foreign officials' attendance in New York shall not be impeded by the US, "irrespective of the relations" between their respective governments and the US.
Abbas' office said it was astonished by the visa decision, which "stands in clear contradiction to international law and the UN Headquarters Agreement, particularly since the State of Palestine is an observer member of the United Nations". It urged the US to reverse the move.
Israel's Foreign Minister Gideon Saar welcomed the State Department's decision.
Hamas has been running the Gaza Strip for years, with its rival Fatah in charge in the West Bank. But even in the West Bank the PA led by Abbas has struggled to govern, faced with rival groups and Jewish settlement expansion.
Abbas is also in charge of the PLO - the umbrella organisation which represents Palestinians at international fora. The PLO has had observer status at the UN since 1974. It can participate in meetings but not vote on resolutions.
Prime Minister Benjamin Netanyahu has constantly rejected the idea of a two-state solution - the long-time international formula to resolve the decades-old Israel-Palestinian conflict. It envisages an independent Palestinian state being created alongside Israel in the West Bank and Gaza Strip with East Jerusalem as its capital.
Netanyahu says recognition of a Palestinian state would amount to rewarding "Hamas's monstrous terrorism".
The Israeli military launched a campaign in Gaza in response to the Hamas-led attack on southern Israel on 7 October 2023, in which about 1,200 people were killed and 251 others were taken hostage.
More than 63,000 people have been killed in Gaza since then, according to the Hamas-run health ministry.
