Israeli forces killed and wounded dozens of Palestinians on Sunday in the northern Gaza Strip, after crowds gathered near a crossing from Israel to try to seize aid from United Nations trucks entering the enclave, according to the Gaza health ministry and health workers.

The episode was the latest in a string of deadly shootings as hunger and desperation have gripped Palestinians in Gaza during Israel’s nearly two-year campaign against Hamas.

The latest attack took place near the Zikim crossing between the Gaza Strip and Israel. More than 60 people were killed while seeking aid in northern Gaza on Sunday, according to the health ministry and Mohammad Abu Salmiya, the director of Al-Shifa Hospital in Gaza City.

A field hospital operated by the Palestine Red Crescent Society in northern Gaza was flooded with gunshot victims from the episode near Zikim. The hospital received two of the dead and more than 100 wounded, said Nebal Farsakh, a spokeswoman for the Red Crescent.

Israeli soldiers fired “warning shots” after thousands of Gazans gathered in the area, the Israeli military said in a statement. They had opened fire to “remove an immediate threat posed to them,” it added, but did not specify the nature of the threat.

The Israeli military also said that the reported number of casualties did “not align” with its initial review, but it did not provide an alternative toll. The military was continuing to examine the episode, it said.