"We are deeply disturbed by the tragic loss of life over the past two weeks of protests carried out within the territory of Gaza, with more than a dozen Palestinians killed by sniper fire - including an unarmed teenager and a respected photojournalist - and many hundreds more injured by live ammunition".
Islam Herzallah, 28, reportedly died in hospital after he was shot by Israeli troops east of Gaza City.
US Senator Bernie Sanders sent a letter to congressional colleagues on Friday urging the White House to take action to improve the "humanitarian crisis" facing Gazans as they protest for the third straight week.
The health ministry said that at least 968 people, including 16 medics and reporters, were wounded by gunfire and tear gas Friday.
The company Murtaja co-founded had been vetted for USA government funding, while an global journalists federation said he was harassed and beaten by Hamas police in 2015. Israel said it will not allow the right of return.
"Nakba Day" recognizes the approximately 750,000 people who left their homes in the violence leading up to and during the May 1948 war between Israel and neighboring countries.The protests, called "The March of Return", are calling for Palestinians who left Israeli areas during and around the May 1948 war and their descendants to be granted the "right to return" to those areas. Since the beginning of the protests, 33 Palestinians have been killed in Gaza, of them 27 during the course of the protests and six in other circumstances.
Israel has declared a no-go zone close to the Gaza border fence. Protesters stuck a Palestinian flag into the fence and affixed a rope, using it to tug at the coils.
One protester was injured in the central Gaza Strip, while another was injured during protests east of Jabaliya in northern Gaza.
Protest organisers say Hamas was invited to provide logistical support to the demonstration and Hamas says it continues to call for peaceful protests.
A Palestinian protester tries to pull apart fencing placed on the Israeli-Gaza Strip border by the Israeli military.
The Israeli-controlled Gaza crossings are closed until Sunday, 15 April, except for urgent humanitarian cases, while the Egyptian controlled crossing, Rafah, exceptionally opened today until tomorrow evening. They also dismantled a number of barbed wire fences deployed at about 20 metres from the perimeter fence by the Israeli military, and attempted to breach the latter.