At least 73 people were killed and around 150 people injured by Israeli gunfire in Gaza while seeking aid on Sunday, according to the Palestinian health ministry.

Some 67 people were killed in northern Gaza, the ministry said, while six others were killed in Khan Younis in the south of the Strip. It is unclear whether the 67 people reported killed in northern Gaza were all killed in the same place or in multiple incidents. It marks one of the highest reported death tolls among recent, repeated cases in which aid seekers have been killed.

The Israel Defense Forces said that troops had “fired warning shots in order to remove an immediate threat posed to them” after “a gathering of thousands of Gazans was identified in the northern Gaza Strip.”

“The IDF is aware of the claim regarding casualties in the area, and the details of the incident are still being examined,” the Israeli military said, without disclosing any casualty figures.

The Israeli military also issued a warning to residents in a number of areas in northern Gaza, including the cities of Beit Lahia, Jabalya and Beit Hanoun.