According to the Israeli army, some 8,000 Gazans had gathered at different spots along the frontier Friday, attempting to sabotage the Israeli border fence.
Israel made a decision to erect a sea barrier in 2014, when several Hamas gunmen tried to enter Israel by sea but were shot dead by soldiers.
It is the latest phase of border demonstrations that began at the end of March, in which at least 159 Palestinians have been killed while one Israeli soldier has been shot dead.
Fire officials in Israel said incendiary balloons and kites set off almost 50 fires in Israel this weekend alone.
Meanwhile, Fatah official Moneer Al-Jaghoub, according to Quds Press, said that "Hamas continues damaging the Palestinian unity and wasting the Palestinians and their cause".
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The warning came amid unconfirmed reports that Israel and Hamas were close to reaching a long-term truce agreement.
Since the 2014 war in Gaza, Israel has maintained an underwater sensor system along the maritime border with the northern Gaza Strip, enabling the Israeli forces to spot divers and swimmers in the area.
Critics say it amounts to collective punishment of the coastal territory's two million residents.
Tel Aviv has set out limited goals for the initial negotiations on the situation in the Gaza Strip, which has seen mass protests, shootings and the use of firebomb kites by Palestinians along the Gaza-Israel fence.
The 12 passengers are mostly from Sweden but also from Germany, Britain, Spain, France and Canada.
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The Fatah movement of Palestinian President Mahmoud Abbas, who holds sway in the Israeli-occupied West Bank, earlier said any deal risked ending hopes of achieving Palestinian statehood.
The SY Freedom for Gaza was carrying mainly medical supplies and two of its passengers were journalists, said an organizer from a group named Ship to Gaza which organized the trip.
The Palestinian Health Ministry has yet to issue a statement about casualties.
Israel also imposed a blockade of Gaza that year, and the United Nations has since warned that the Strip would be "unlivable" by 2020 if the blockade is not lifted.
The Israeli navy intercepted a Swedish-flagged activist boat bent on breaching its more than decade-long blockade of Gaza, the second in less than a week, the military said on Saturday.
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Paris Saint-Germain have also been linked with the vastly experienced Germany global . To me, he's one of the best central defenders in the world'.