“Today, to revive the hope of peace for the Palestinians and Israelis, and a two state solution, the United Kingdom formally recognises the State of Palestine,” the prime minister said on X, alongside a longer video statement.
“In the face of the growing horror in the Middle East, we are acting to keep alive the possibility of peace and a two-state solution.
“That means a safe and secure Israel alongside a viable Palestinian state. At the moment, we have neither.”
Sir Keir said in July that the government would make the move unless Israel met certain conditions.
It comes ahead of a conference of the UN General Assembly in New York this week, which is set to be dominated by questions of Palestinian statehood.
Canada and Australia also officially recognised Palestinian statehood on Sunday.
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