Israelis wave national flags outside the Old City's Damascus Gate, in Jerusalem, Sunday, May 13, 2018. Israel is marking the 51st anniversary of its capture of east Jerusalem in the 1967 Middle East war. (AP Photo/Ariel Schalit)

Israelis wave national flags outside the Old City's Damascus Gate, in Jerusalem, Sunday, May 13, 2018. Israel is marking the 51st anniversary of its capture of east Jerusalem in the 1967 Middle East war. (AP Photo/Ariel Schalit)

JERUSALEM (AP) — Israel on Sunday kicked off festivities to celebrate the opening of the new U.S. Embassy in Jerusalem, even as it bolstered its forces along the Gaza border and in the West Bank in anticipation of mass Palestinian protests of the move.

A day before the embassy’s formal opening, Israel hosted a gala party at its Foreign Ministry with President Donald Trump’s daughter Ivanka, her husband, Jared Kushner, and other American VIPs.

Prime Minister Benjamin Netanyahu praised Trump’s “bold decision” in upending decades of U.S. policy by recognizing Jerusalem as Israel’s capital. “It’s the right thing to do,” a smiling Netanyahu told the jubilant crowd.

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Trump announced his decision on Jerusalem in December, triggering a joyous reaction from Netanyahu’s nationalist government. The move infuriated the Palestinians, who claim Israeli-annexed east Jerusalem as their capital.

Palestinian President Mahmoud Abbas halted ties with the Trump administration and declared it unfit to remain in its role as the sole mediator in peace talks.

The rival Hamas movement, which controls the Gaza Strip, has been staging a series of weekly demonstrations against a crippling Israeli-Egyptian blockade of the territory. Those protests are to climax Monday, with tens of thousands of people expected to gather along the Israeli border in an event timed to coincide with the U.S. Embassy move.

Hamas has signaled that large crowds, numbering perhaps in the thousands, might try to break through the border fence to realize the “right of return” to lost homes.

Both the embassy move and the protests have symbolic timing. Trump has said the opening is meant to coincide with the 70th anniversary of Israel’s establishment. The Palestinian protests also mark the date as the anniversary of their “naqba,” or catastrophe, when hundreds of thousands of people fled or were forced from their homes during the war surrounding the event. About two-thirds of Gaza’s 2 million people are descendants of Palestinian refugees.

A mass border breach could trigger potentially lethal Israeli force. Forty-two Palestinians have been killed and over 1,800 have been wounded by Israeli fire since the weekly protests began on March 30. The U.N., European Union and rights groups have accused Israel of using excessive force against unarmed protesters.

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Israel says it is protecting a sovereign border and accuses Hamas of using the unrest to plan and carry out attacks. Marchers have thrown stones and burned tires at the fence and flown flaming kites over it to try to set Israeli fields on fire.

On Friday, a Palestinian crowd attacked the main cargo crossing between Israel and Gaza, disrupting shipments of cooking fuel, gasoline and building materials, and causing millions of dollars in damage. Israeli officials said it could take weeks or months to repair the crossing.

“Unfortunately, the crossing is closed today and will remain closed until the foreseeable future due to severe damage caused by Palestinian rioters,” said Lt. Col. Jonathan Conricus, a military spokesman. “It is still unclear how long it will take to fix and replace the necessary parts.”

The Israeli military announced that it bolstered forces on the Gaza border with combat battalions, special units, intelligence forces and snipers. Israeli warplanes also dropped leaflets in Gaza, urging residents to stay far from the fence.

“You deserve a better government. You deserve a better future,” the leaflets said. “Do not approach the security fence nor participate in the Hamas display that is putting you in risk.”

A high-ranking delegation of Gaza’s Hamas rulers headed Sunday to Egypt, amid diplomatic efforts aimed at containing the mass rally. But one of the Hamas participants, Khalil al-Hayya, said there were no breakthroughs and the march would go on as planned Monday.

The army said it was also reinforcing its troops in the West Bank with several combat battalions and intelligence units in case of possible unrest there as well.

Sunday’s celebrations coincided with Israel’s “Jerusalem Day,” the 51st anniversary of what it refers to the city’s “unification” during the 1967 Mideast war.

Israel immediately annexed east Jerusalem — home to the city’s most sensitive Jewish, Muslim and Christian holy sites — in a move that has not received international recognition. The Palestinians claim east Jerusalem as the capital of a future state.

In an annual ritual, tens of thousands of Israelis marched through Jerusalem’s Old City to mark the day. Revelers sang, danced and waved Israeli flags.

Earlier Sunday, Netanyahu told his Cabinet that there would be a “series of decisions” to build up Jerusalem, including its contested eastern sector. Shortly after, the government approved construction of a $57 million cable car system that will link west Jerusalem to the Old City.

Although Trump has said his declaration does not set the final borders of the city, his recognition of Jerusalem as Israel’s capital has been perceived by both Israel and the Palestinians as taking Israel’s side in the most sensitive issue in their conflict. Only two countries, Guatemala and Paraguay, have said they will follow suit. Most of the world maintains embassies in Tel Aviv, saying the Jerusalem issue must first be resolved.

In a reflection of the deep sensitivities, dozens of countries — including Britain, France and Germany — skipped Sunday night’s celebration at the Israeli Foreign Ministry.

Netanyahu, who frequently clashed with President Barack Obama, has found a welcome partner in Trump. The new administration has lined up solidly behind Netanyahu in his dealings with the Palestinians and delighted him last week when it withdrew from the international nuclear deal with Iran, Obama’s top foreign policy achievement.

Addressing the crowd Sunday evening, Netanyahu said Israelis would be “eternally grateful” for Trump’s decision on Jerusalem.

“Thank you, President Trump, for your bold decision. Thank you for making the alliance between Israel and the United States stronger than ever,” he said.

Netanyahu said Trump’s decision recognized a 3,000-year Jewish connection to Jerusalem and the “truth” that Jerusalem will be Israel’s capital under any future peace deal.

“It’s been the capital of our state for the past 70 years. It will remain our capital for all time,” he said.

Kushner and Ivanka Trump sat in the front row near Netanyahu during the ceremony but did not speak. Netanyahu called their presence a “national and international statement” that “touches our hearts.”

U.S. Treasury Secretary Steven Mnuchin said Trump was fulfilling a key campaign promise by moving the embassy. “The United States has no greater partner than Israel,” he said.

Jeremy Ben-Ami, president of J Street, a liberal pro-Israel group in the U.S., expressed concern that the embassy move would backfire.

He accused the White House of putting the interests of a small group of hard-liners ahead of the larger interest of promoting peace with the Palestinians.

“Making a move like this removes the U.S. as a credible mediator,” he said.

The Palestinian ambassador to Washington sharply condemned the relocation of the U.S. Embassy in a statement Sunday.

“Tragically, the US administration has chosen to side with Israel’s exclusivist claims over a city that has for centuries been sacred to all faiths,” said Husam Zomlot.

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Associated Press writer Josh Lederman in Washington contributed to this report.