RAFAH, Gaza Strip — 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.

The near-daily shootings have occurred after an Israeli and U.S.-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.” 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.”