At least 36 people were killed by Israeli fire while they were on their way to an aid distribution site in Gaza at dawn on Saturday, according to the Gaza Health Ministry and Nasser Hospital in Khan Younis.
The Israeli military said it had fired warning shots at suspects who approached its troops after they did not heed calls to stop, about a kilometre away from an aid distribution site that was not active at the time.
Gaza resident Mohammed Al Khalidi said he was in the group approaching the site and heard no warnings before the firing began.
"We thought they came out to organise us so we can get aid, suddenly (I) saw the jeeps coming from one side, and the tanks from the other and started shooting at us," he said.
The Gaza Humanitarian Foundation, a U.S.-backed group which runs the aid site, said there were no incidents or fatalities there on Saturday and that it has repeatedly warned people not to travel to its distribution points in the dark.
"The reported IDF (Israel Defence Forces) activity resulting in fatalities occurred hours before our sites opened and our understanding is most of the casualties occurred several kilometres away from the nearest GHF site," it said.
The Israeli military said it was reviewing the incident.