Israeli Prime Minister Benjamin Netanyahu said on Tuesday that Israel mistakenly killed seven people working for the aid charity World Central Kitchen in a Gaza airstrike, and the U.S. and other allies called for explanations amid widespread condemnation.

Israel's military voiced "sincere sorrow" over the incident, which ratcheted up international pressure for steps to ease the disastrous humanitarian situation in Gaza nearly six months into Israel's siege and invasion of the Palestinian enclave.

The strike on the World Central Kitchen convoy killed citizens of Australia, Britain and Poland, as well as Palestinians and a dual citizen of the United States and Canada.