Palestinian medical officials said at least 15 people were wounded in Gaza Israeli forces have fired on groups of protesters at border points with Gaza and on the Golan Heights border with Syria, reports say.
The Israeli military said it opened fire on the Golan Heights as a group tried to breach the border. Reports said at least 10 were injured.
At least 45 Palestinians were injured as Israeli forces fired at a group near a Gaza border crossing, medics said.
Palestinians are marking the Nakba, or “catastrophe”, of Israel’s founding.
Hundreds of thousands of Palestinians fled or were forced out of their homes in fighting after the state of Israel was created in 1948.
The BBC’s John Donnison, in the West Bank town of Ramallah, said this year’s Nakba protests have been given impetus by the uprisings in countries across the Middle East and North Africa.
In Ramallah there have been clashes at a border crossing into East Jerusalem.
Palestinian protesters have been throwing stones at Israeli security forces, who have been firing tear gas and rubber bullets.
The Israeli military said it only fired warning shots on the Golan Heights as protesters tried to breach a border fence. But unconfirmed reports said four people had been killed and at least 10 people injured.
To the south, at the Erez border crossing between Israel and Gaza, Israeli troops opened fire with tanks and machine guns injuring at least 15 people, Palestinian medical officials said.
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