Israel’s Prime Minister Benjamin Netanyahu has said Sunday’s deadly Israeli airstrike on a Rafah camp had gone tragically wrong.

“Despite our best effort, not to harm those not involved, unfortunately a tragic mistake happened last night. We are investigating the case,” Netanyahu said about the strike in a speech at the Israeli Knesset on Monday.

At least 45 people were killed and 200 wounded after the Israeli strike hit a camp for displaced people, according to the government media office in Gaza.

The Israeli military’s General Staff’s Fact-Finding and Assessment Mechanism is investigating an airstrike carried out in Rafah on Sunday, the Israel Defense Forces (IDF) said in a statement on Monday.