The Palestinian death toll in last week's mass protest on the Gaza-Israel border has risen to 18, officials said, as Israel rejected allegations of unlawful use of lethal force against unarmed demonstrators.
More than 750 Palestinians were wounded by Israeli fire in Friday's protest, according to Gaza health officials, making it the bloodiest day in Gaza since the 2014 Israel-Hamas war.
Gaza's Hamas rulers have not said if the final aim of protests, which are to continue off-and-on for six weeks, is an attempted mass breach of the border fence.
Hamas leader Ismail Haniyeh on Sunday hinted at an escalation, saying last Friday's protests had a "limit", but that "next time, we won't know where that line would be".
"Only one side fired ALL the bullets, ALL the mortar shells, ALL the tear gas."April 1, 2018
Israel accused Islamic militants Hamas of trying to attack its border under the guise of protests.
Officials said Israel has a right to defend its border and that troops were instructed to target what the army described as the "main instigators".
However, the military's open-fire policies came under more scrutiny as two amateur videos emerged purportedly showing two Palestinians being shot - one killed and one wounded - while not posing any apparent threat to soldiers.
In one video, a man later identified as Ibrahim Abu Shanab is seen kneeling on the ground in the first of two rows of worshippers on Friday, facing the border fence at a distance of 150 to 200 metres.
Suddenly, he stands up, limps a few metres, collapses and is carried away by a young man who shouts "Allahu Akbar", or "God is Great."
Adli Abu Taha, who filmed the scene on his mobile phone, told the Associated Press that Mr Abu Shanab had thrown stones close to the fence before joining the group for Friday prayers.
The incident took place east of the southern Gaza city of Rafah, and medics said Mr Abu Shanab was shot in the leg.
In another video that spread on social media, a young man is seen being fatally shot from behind while running away from the border area carrying a tyre.
The Israeli military accused Hamas on Sunday of releasing videos that were incomplete, edited or "completely fabricated", but did not elaborate.
The military said troops followed strict rules of engagement and that protesters were putting themselves in "harm's way" by operating in a dangerous area.
Israeli military officials have said troops would not allow protesters to cross or damage the border fence, and that protesters would not be permitted to get closer than 100 metres to the fence.
The officials did not say how troops would respond if "red lines" were crossed.
An Associated Press reporter saw two young men getting shot in the legs on Saturday, in incidents about 15 minutes apart, as they stepped away from a group of dozens of people standing about 200 metres from the border and walked closer to the fence.
In Friday's protests, thousands gathered near the border in several locations.
Smaller groups moved closer to the fence, throwing stones or burning tyres.
Israeli lady at Anti-War protest in Tel-Aviv says:
"I want people in Gaza to know that they are not alone and many people in Israel do care and we are doing everything we can to stop the next person getting killed & to stop the war" pic.twitter.com/VlRPLmiCG1— The Pileus (@thepileus) April 1, 2018
The military said that in one incident two armed men opened fire near the fence.
Rights groups said it is unlawful to use lethal force when Palestinian protesters do not pose an imminent threat to the lives of Israeli soldiers.
"An army can use reasonable force to defend a border," said Omar Shakir, of the international group Human Rights Watch.
"This was an incident where soldiers were firing from behind the fence, separated by buffer zones and other objects, firing on individuals well behind the fence, in some cases retreating, not moving forward, or advancing without posing imminent threat."
Israel's defence minister Avigor Lieberman has rejected international calls for an investigation.
While #Hamas presents its campaign on Israel's border to the world as a peaceful enterprise, it is using #Gaza masses to ignite a violent confrontation with Israel. https://t.co/Ly97X02ByU pic.twitter.com/86RevWOlSf— Israel Foreign Ministry (@IsraelMFA) March 31, 2018
The death toll for Friday rose to 18 after a 29-year-old man died on Monday of his injuries.
The militant group Islamic Jihad said the man had been a member.
The Israeli military has said 10 of the Palestinians killed on Friday were members of Hamas and other militant groups, but did not say if any were armed except for the two who had opened fire near the fence.
Amos Gilad, a retired senior defence official, accused Hamas on Monday of cynically exploiting civilians, alleging the group "wants headlines through blood".
Everything you need to know about the riots in Gaza today, explained by Maj. Keren Hajioff pic.twitter.com/irJL12DrQp— Israel Defense Forces (@IDF) March 30, 2018
"The big achievement of last Friday is that they (marchers) didn't cross the border," he told Israel TV's 10.
"Israel cannot allow violent Palestinians who are being sent by an organisation whose aim is to destroy the state (of Israel)" to enter Israeli territory, he said.
The idea for the mass marches was first floated by a Gaza social media activist several months ago, and was later adopted by Hamas, which has ruled Gaza since a violent takeover of the territory in 2007.
In response to Hamas rule, Israel and Egypt enforced a crippling blockade of Gaza's borders. Israel and Hamas fought three cross-border wars.
Protests are to continue until May 15, the 70th anniversary of Israel's founding.
The date is mourned by Palestinians as their "nakba", or catastrophe, when hundreds of thousands were uprooted in the 1948 Middle East war over Israel's creation.
Most of Gaza's two million people are descendants of Palestinian refugees.
Gaza's continued border closure has made it increasingly difficult for Hamas to govern.
Life in the coastal strip has deteriorated further in recent months, with rising unemployment, grinding poverty and daily blackouts that last for hours.
In a risky strategy, Hamas appears to be using the protests to draw attention to the difficult conditions in Gaza, without plunging into another war with Israel.
The sides have fought three wars in the past decade, resulting in heavy losses to Hamas and heavy damage to Gaza.
- By Press Association & Digital Desk