DEIR al-BALAH, Gaza Strip — Israeli airstrikes killed 15 Palestinians in Gaza early Friday, while a hospital said another 20 people died in shootings while waiting for aid.

Meanwhile, the U.N. human rights office says it has recorded 613 Palestinians killed within the span of a month in Gaza while trying to obtain aid. Most were killed while trying to reach food distribution points run by an Israeli-backed American organization, while others were massed waiting for aid trucks connected to the United Nations or other humanitarian organizations.

Spokeswoman Ravina Shamdasani said the rights office was not able to attribute responsibility for the killings. But she said “it is clear that the Israeli military has shelled and shot at Palestinians trying to reach the distribution points” operated by the Gaza Humanitarian Foundation.

In a message to The Associated Press, Shamdasani said that of the total tallied, 509 killings were “GHF-related,” meaning at or near its distribution sites.

“Information keeps coming in,” she added. “This is ongoing and it is unacceptable.”

The GHF has denied any serious injuries or deaths on its sites and says shootings outside their immediate vicinity are under the purview of Israel’s military. In a statement Friday, GHF cast doubt on the casualty figures and accused the U.N. of trying “to falsely smear our effort.”

The Israeli military also issued new evacuation orders Friday in northeast Khan Younis and urged Palestinians to move west ahead of planned military operations against Hamas in the area. The new evacuation zones pushed Palestinians into increasingly smaller spaces by the coast.

Since GHF began distributions in late May, witnesses have said almost daily that Israeli troops open fire on crowds of Palestinians on the roads leading through military-controlled zones to the food centers

The Israeli military has said previously it fires warning shots to control crowds or at Palestinians who approach its troops. On Friday, in reaction to the U.N. report, it said in a statement that it was investigating reports of people killed and wounded while seeking aid.