Israeli forces in the Gaza Strip opened fire as people headed toward an aid distribution site a kilometer away at around sunrise, killing at least three people and wounding dozens, health officials and a witness said.

Antonio Guterres says he is "appalled" by reports of Palestinians being killed and injured while seeking aid in Gaza.

The Palestinians were shot and scores wounded as huge crowds assembled to try and get food from a new aid distribution center. An Israeli military official said soldiers fired warning shots.