She walked for hours in hope of getting food. Israeli forces killed her, family says.

It was 8 p.m., just after sunset, when Reem Zeidan, 42, set off for an aid distribution site with two of her eight children, Mervat, 20, and Ahmad, 12.

It was 8 p.m., just after sunset, when Reem Zeidan, 42, set off for an aid distribution site with two of her eight children, Mervat, 20, and Ahmad, 12. Zeidan wanted to get a bag of flour to make bread. Her 5-year-old daughter, Razan, was hoping for biscuits. Zeidan brought a blue backpack to carry whatever she might be able to bring home.

Distribution wouldn’t open until the next morning, June 3, but the walk along a sea route, from Khan Younis, where they were sheltering in a tent, to Rafah, where the aid site was, would take hours. On the first day the distribution site opened, Zeidan had arrived at 9 a.m., too late to collect any food. Another day, she turned back when she heard there was gunfire near the site.

By then, there had already been multiple incidents in which Palestinians were reported to have been killed while seeking aid in Gaza after a new distribution program was launched just over a week before, led by a recently founded U.S.- and Israel-backed group called the Gaza Humanitarian Foundation.

Reem Zeidan, wearing black and pink, with her daughters.Supplied to NBC NewsThe United Nations, which had previously run a network of hundreds of aid distribution points across Gaza but has since been sidelined by Israel, warned that reducing aid distribution to GHF’s four sites would be chaotic, insufficient and dangerous. Since GHF began operations on May 26, scores of Palestinians have been killed by Israeli forces while trying to reach its aid distribution sites, according to the local health ministry and witnesses.

The United Nations human rights office said on Tuesday that more than 400 Palestinians are believed to have been killed while trying to collect humanitarian aid in just under a month.