Israeli forces fired on people as they headed toward an aid distribution site in Gaza on Tuesday, killing at least 27, Palestinian health officials and witnesses said, in the third such shooting in three days.

The army said it fired “near a few individual suspects” who left the designated route, approached its forces and ignored warning shots, reports AP.

The near-daily shootings have occurred after an Israeli and US-backed foundation established aid distribution points inside Israeli military zones, a system it says is designed to circumvent Hamas.

The United Nations has rejected the new system, saying it doesn't address Gaza's mounting hunger crisis and allows Israel to use aid as a weapon.

The Israeli military said it “fired to drive away suspects."

Hungry Palestinians in Gaza block and offload dozens of UN food trucks

In a statement, army spokesperson Effie Defrin said "the numbers of casualties published by Hamas were exaggerated” but that the incident was being investigated. He said the army is not preventing Palestinians in Gaza from reaching aid in the distribution areas, but rather allowing it.

The Gaza Humanitarian Foundation, which operates the sites, says there has been no violence in or around them.

On Tuesday, it acknowledged that the Israeli military was investigating whether civilians were wounded “after moving beyond the designated safe corridor and into a closed military zone,” in an area that was “well beyond our secure distribution site.”

A spokesperson for the group said it was “saddened to learn that a number of civilians were injured and killed after moving beyond the designated safe corridor."

Gaza's roughly two million people are almost completely reliant on international aid because Israel’s offensive has destroyed nearly all of Gaza’s food production capabilities. Israel imposed a blockade on supplies into Gaza in March, and limited aid began to enter again late last month after pressure from allies and warnings of famine.

The shootings all occurred at the Flag Roundabout, around a kilometre (half-mile) from one of the GHF’s distribution sites in the now mostly uninhabited southern city of Rafah.

The entire area is an Israeli military zone where journalists have no access outside of army-approved embeds.