In total 32 Palestinians have been shot dead by Israeli forces.
The Israeli navy says Hamas has been utilizing the demonstrations as cowl for assaults, and says militants have tried to hold out shootings, plant bombs and infiltrate the fence with a objective to assault inside Israel.
Israel says it has no selection, accusing Hamas of attempting to smuggle weapons and supplies that may turn into weapons into the territory.
The Hamas-led riots at the Israel-Gaza border intensified on April 6, as at least seven protesters have died while protesters conjure smoke over the border.
On Friday, tens of thousands of Palestinians gathered along the security fence, burning tires and throwing firebombs and rocks at Israeli soldiers, who responded with tear gas and live fire, the army and witnesses said, as Palestinians held a second "March of Return" protest.
Yehia Abu Daqqa, a 20-year-old student, said he had come to honor those killed in previous protests. "Anticipate our nice transfer, once we breach the borders and pray at Al-Aqsa", referring to the key Muslim shrine in Jerusalem.
"There were attempts to carry out acts of terrorism ... using the smoke for cover", IDF spokesman Rob Manelis said.
"IDF troops fired toward them", the army said. Hundreds more suffered other injuries, including tear gas inhalation, the officials said.
Israel's use of live fire last week has come under criticism from rights groups, while the European Union and United Nations chief Antonio Guterres have called for an independent investigation.
"I particularly urge Israel to exercise extreme caution with the use of force in order to avoid casualties", he said.
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Meanwhile, at the United Nations, for the second week in a row, the USA vetoed a U.N. Security Council (UNSC) resolution calling for an independent inquiry into the killing of Palestinians in Gaza by the IDF.
Palestinian U.N. Ambassador Riyad Mansour told reporters at U.N. headquarters in New York Friday evening that 14 of the 15 council nations agreed to the statement, but the U.S., Israel's closest ally, objected.
Palestinian UN Ambassador Riyad Mansour told reporters at UN headquarters in NY that the United States rejection is very irresponsible.
Nahal Oz, like dozens of other villages and working class towns on the Gaza periphery, has over the years been targeted by Palestinian short-range rockets and mortar bombs and faced the threat of Hamas cross-border tunnels.
Hamas and Israel have fought three wars in the Gaza Strip since 2009.
Hamas's armed wing has claimed only five of them, saying they were participating "in popular events side-by-side with their people".
The crowd size was seen as a test for Hamas, an Islamic militant group that seized the territory in 2007 from its political rival, Palestinian President Mahmoud Abbas.
Hamas has meanwhile offered compensation of $3,000 to the families of protesters killed and $500 for those seriously injured, drawing outrage from Israel.
Palestinians are now into the second week of a six-week long period of demonstrations in support of refugees expelled from their homes.