The damage caused by the explosion at a UN building in Gaza’s Deir el-Balah last month that killed a European staffer and wounded several others was reportedly consistent with two Israeli tank rounds, Al Jazeera reports citing a report by the Washington Post.

The Israeli-made M339 high-explosive, multipurpose round was likely left by the fragments found at the scene, the Washington Post reported after speaking with multiple international experts.

After the attack, the UN significantly downsized its presence in Gaza, as the Israeli military continues to blockade all aid and attack the enclave.

The UN said Israel was behind the attack, but the Israeli army denied responsibility.