 "Gaza violence: 16 Palestinians dead, 1,400 injured by Israeli forces")
Clashes erupted as tens of thousands of Gazans marched near the Israeli border in a major protest on Friday, leaving 16 Palestinians dead and hundreds more wounded in the conflict's worst single day of violence since the 2014 Gaza war.
Late in the day, Israel's military targeted three Hamas sites in the Gaza Strip with tank fire and an air strike after what it said was an attempted shooting attack against soldiers along the border that caused no injuries.
Protesters, including women and children, had earlier gathered at multiple sites throughout the blockaded territory, which is flanked by Israel along its eastern and northern borders.
Smaller numbers approached within a few hundred metres (yards) of the heavily fortified border fence, with Israeli troops using tear gas and live fire to force them back.
Israeli security forces used a drone to fire tear gas toward those along the border, in one of the first uses of the device, a police spokesman said.
The health ministry in Gaza said 16 Palestinians were killed by Israeli forces.
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More than 1,400 were injured, including 758 by live fire, with the remainder hurt by rubber bullets and tear gas inhalation, it said.
Palestinians accused Israel of using disproportionate force, as did Turkey.
The UN Security Council was to hold closed-door talks about the situation in Gaza later on Friday at the request of Kuwait, a diplomat said.
UN responds
The UN Security Council heard fears of a further escalation in Israeli-Palestinian violence in the Gaza Strip during emergency talks on Friday despite a failure to agree a joint statement on deadly clashes.
UN Secretary-General Antonio Guterres also called for an "independent and transparent investigation" and reaffirmed "the readiness" of the world body to revitalise peace efforts, a spokesperson said.
Kuwait requested the meeting to discuss the unraveling situation in Gaza, where Palestinians said Israeli fire killed 16 people in the conflict's deadliest single day since the 2014 Gaza war.
"There is fear that the situation might deteriorate in the coming days," said assistant UN secretary general for political affairs, Taye-Brook Zerihoun, urging maximum restraint.
Britain and the United States expressed regret that the timing of the meeting -- the first night of Passover -- meant Israeli officials could not attend. Leading ambassadors sent deputies in their place.
"It's vital that this Council be balanced in its approach," a US diplomat told the meeting. "We should have found an arrangement for all parties to participate tonight," he added.
"We are deeply saddened by the loss of life today," the diplomat added. "Bad actors who use protests as a cover to incite violence endanger innocent lives," he added.
"The risk of escalation is very real," the French representative said. "There is the possibility of a new conflict in the Gaza Strip."
Arab League calls Israel's actions 'savagery'
Egypt and Jordan, the only two Arab countries to have signed peace treaties with Israel, denounced the use of force against the protesters while the Arab League condemned what it called Israel's "savagery".
Israel's military alleged that the main protests were being used as cover by militants to either break through the border or carry out attacks.
"It is not a peaceful demonstration," an Israeli military official told journalists.
"There was no small number of attempts to damage the fence and cross" the border, she added.
The army said it estimated some 30,000 demonstrators were taking part in the protests.
"Rioters are rolling burning tyres and hurling firebombs and rocks at the security fence and at (Israeli) troops, who are responding with riot dispersal means and firing towards main instigators," it said.
Protesters were demanding hundreds of thousands of Palestinian refugees who fled or were expelled during the war surrounding Israel's creation in 1948 be allowed to return.
Hamas leader Ismail Haniya attended the protest, believed to be the first time he has gone so close to the border in years.
Hamas and Israel have fought three wars since 2008, the most recent of which in 2014 ended with a fragile truce.
Far smaller protests broke out in parts of the occupied West Bank.
On Friday evening, Gazan leaders called on protesters to retreat from the border area until Saturday, with the demonstration planned to last six weeks, until the inauguration of the new US embassy in Jerusalem around May 14.
Palestinians mourn
Palestinian president Mahmud Abbas declared Saturday a day of national mourning.
In a later speech Friday he said he held Israel fully responsible for the deaths.
The upcoming embassy move has added to tensions surrounding the march.
US President Donald Trump's recognition of Jerusalem as Israel's capital in December has infuriated Palestinians, who claim its annexed eastern sector as the capital of their future state.
The protest also began as Jewish Israelis were to mark the Passover holiday.
Israel announced a "closed military zone in the area surrounding the Gaza Strip," accusing its Islamist rulers Hamas of using the lives of civilians "for the purpose of terror".
It deployed reinforcements, including more than 100 special forces snipers, for fear of mass attempts to break through the security fence.
Israeli Defence Minister Avigdor Lieberman said in a tweet directed to Gazans in both Hebrew and Arabic that "Hamas's leadership is playing with your life".