Gaza braced for further violent protests
Fresh protests against Israel are expected in the Palestinian territories, a day after Israeli troops killed 55 people in Gaza.
Tuesday marks the 70th anniversary of what Palestinians call the Nakba, or Catastrophe, that saw thousands flee amid the creation of Israel in 1948.
Tensions will be particularly high in Gaza where funerals for those killed on Monday are due to take place.
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The violence came as the US opened a controversial embassy in Jerusalem.
The move of the US embassy from Tel Aviv has incensed Palestinians, who claim eastern Jerusalem as the capital of a future Palestinian state.
They see the US move as backing Israeli control over the whole of the city, which Israel regards as its indivisible capital.
Palestinian officials said that, as well as those killed, about 2,700 people were injured in Monday's violence. It was the deadliest day in Gaza since the 2014 war.
Israeli PM Benjamin Netanyahu said his military was acting in self-defence against Gaza's Islamist rulers, Hamas, who he said wanted to destroy Israel.
The Palestinian Authority's leader condemned a "massacre". The UN spoke of "outrageous human rights violations".
What happened at the Gaza border?
Palestinians were demonstrating on Monday as they have been for six weeks as part of a protest, orchestrated by Hamas, called the "Great March of Return".
However, Monday's protests - and those planned for Tuesday - are the culmination as they mark the anniversary of Israel's creation in 1948 and commemorate the hundreds of thousands of Palestinians who subsequently fled their homes or were displaced in the war that followed.
Monday also coincided with the dedication ceremony for the US embassy.
Israel said some 40,000 Palestinians had taken part in "violent riots" at 13 locations along the Gaza Strip security fence.
Palestinians hurled stones and incendiary devices, while the Israeli military used tear gas and live fire from snipers.
Mr Netanyahu defended his military, saying: "Every country has an obligation to defend its borders.
"The Hamas terrorist organisation declares its intention to destroy Israel and sends thousands to breach the border fence in order to achieve this goal. We will continue to act with determination to protect our sovereignty and our citizens."
An Israel Defense Forces (IDF) spokesman said soldiers had fired on those engaged in "terrorist activity and not on demonstrators, who were dispersed by usual means such as tear gas and according to the rules of engagement".
Announcing three days of mourning, Palestinian Authority President Mahmoud Abbas said: "Today once again, the massacres against our people continue."
What has the international reaction been?
There has been a sometimes fiercely conflicting response:
- White House spokesman Raj Shah said: "The responsibility for these tragic deaths rests squarely with Hamas... Hamas is intentionally and cynically provoking this response"
- Kuwait drafted a UN Security Council statement calling for an independent inquiry into the violence - and expressing "outrage and sorrow" - but this was blocked by the US
- EU foreign policy chief Federica Mogherini and the UK called for restraint
- Germany said Israel had the right to defend itself but should do so proportionately
- France's President Emmanuel Macron condemned violence by the Israeli military against the protesters
- Turkey said the US shared responsibility with Israel for a "vile massacre" and that it was recalling its ambassadors from both the US and Israel
- One of the strongest statements came from UN High Commissioner for Human Rights Zeid Ra'ad al-Hussein, who condemned the "shocking killing of dozens, injury of hundreds by Israeli live fire"
- South Africa also recalled its ambassador to Israel, condemning "the indiscriminate and grave manner of the latest Israeli attack"
Was the violence linked to the opening of the embassy?
There were clashes between Israeli police and protesters who raised Palestinian flags outside the new embassy in Jerusalem and several protesters were detained.
Hamas had said the border protests were being stepped up for Monday and Tuesday anyway, but Mr Abbas's response to the US embassy move showed the anger among Palestinians.
He said: "We hear that they opened an embassy today. It is a settlement, not an embassy. A US settlement in East Jerusalem."
The atmosphere at the dedication ceremony was certainly in stark contrast to that at the Gaza border.
President Donald Trump sent a video message to the event, saying Israel had the "right to determine its own capital".