friendly fire
fratricide

Family members said military officials told them he had been killed by friendly fire.

The first night they came and told us he was killed by friendly fire.

The effects of friendly fire, however, are not just material.

There was no point getting killed by friendly fire if he could help it.

The rest pulled up and away to avoid friendly fire.

Another went missing in action and two others were killed by friendly fire.

Michael ended up being shot four times in "friendly fire."

But after incidents of friendly fire, they were not called again for close air support.

As the men near the German lines, they radio ahead to avoid friendly fire.

Close air support and friendly fire should be easier to tell apart.