Palestinian demonstrators gesture in front of Israeli forces during a protest marking the 71st anniversary of the 'Nakba', or catastrophe, when hundreds of thousands fled or were forced from their homes in the war surrounding Israel's independence in 1948, at the Israel-Gaza border fence, in the southern Gaza Strip May 15, 2019. Israeli troops wounded nearly 50 Palestinians at the Gaza border on Wednesday during protests to mark the 71st anniversary of the "Nakba", or catastrophe, when many Palestinians lost their homes in the fighting around Israel's creation, Gaza officials said. REUTERS/Ibraheem Abu Mustafa

A wounded Palestinian boy is evacuated during a protest marking the 71st anniversary of the 'Nakba', or catastrophe, when hundreds of thousands fled or were forced from their homes in the war surrounding Israel's independence in 1948, at the Israel-Gaza border fence, in the southern Gaza Strip May 15, 2019. Thousands had gathered at the coastal enclave's frontier with Israel, the scene of bloodshed over the past year that has raised international concern. REUTERS/Ibraheem Abu Mustafa

A woman holding a Palestinian flag gestures in front of Israeli forces during a protest marking the 71st anniversary of the 'Nakba', or catastrophe, when hundreds of thousands fled or were forced from their homes in the war surrounding Israel's independence in 1948, at the Israel-Gaza border fence, in the southern Gaza Strip May 15, 2019. Groups approached the border fence, planting Palestinian flags and throwing stones towards Israeli soldiers on the other side despite the efforts of marshalls in orange vests to keep protesters away from the barrier, witnesses said. REUTERS/Ibraheem Abu Mustafa

Palestinian demonstrators run for cover from tear gas canisters fired by Israeli forces during a protest marking the 71st anniversary of the 'Nakba', or catastrophe, when hundreds of thousands fled or were forced from their homes in the war surrounding Israel's independence in 1948, near the Israel-Gaza border fence, east of Gaza City May 15, 2019. Israeli troops fired tear gas and rubber bullets to repel them, but also live ammunition, the witnesses said. The Gaza Health Ministry said at least 47 people were wounded, though it was not clear how many of those were hit by live ammunition or were hurt by rubber bullets or by inhaling tear gas. REUTERS/Mohammed Salem

Palestinian demonstrators take cover during a protest marking the 71st anniversary of the 'Nakba', or catastrophe, when hundreds of thousands fled or were forced from their homes in the war surrounding Israel's independence in 1948, at the Israel-Gaza border fence, in the southern Gaza Strip May 15, 2019. REUTERS/Ibraheem Abu Mustafa

Palestinians gather during a protest marking the 71st anniversary of the 'Nakba', or catastrophe, when hundreds of thousands fled or were forced from their homes in the war surrounding Israel's independence in 1948, near the Israel-Gaza border fence, east of Gaza City May 15, 2019. The Israeli military said about 10,000 rioters and demonstrators gathered in several places along the Gaza Strip fence. Wednesday's rallies were called to mark Nakba Day, what Palestinians term the catastrophe that befell them at Israel's creation in 1948, when hundreds of thousands fled or were expelled from lands in what is now Israel. REUTERS/Mohammed Salem