Israeli Prime Minister Benjamin Netanyahu admitted on Monday that his military’s gruesome attack that killed dozens of displaced Palestinians at a tent camp in Rafah was a “tragic mistake,” as his government faces international condemnation for the strikes that engulfed the so-called “safe zone” in flames.

“Despite our utmost efforts not to harm innocent civilians, last night, there was a tragic mistake,” Netanyahu told Israel’s parliament. “We are investigating the incident and will obtain a conclusion because this is our policy.”

On Sunday night, Israeli forces began bombing a tent camp in the southern Gaza city that was designated as a “safe zone” for displaced Palestinians to shelter. Local health officials said the strikes have killed at least 45 people, and that the number is expected to rise as people continue to dig through the rubble.

Netanyahu faced swift condemnation from the international community for the attack, with human rights groups, aid organizations and Western leaders calling for a cease-fire between Israel and Hamas.

This is a developing story. Please check back for updates.