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That's not how most of the people were shot or injured that day, is it though. Most reports describe it as a pretty amped chaotic situation.
Murder would be more appropriate if you're looking for strong terms. Unlawful killings if you're not.
Execution clearly implies carrying out a death sentence based on someone's actions or supposed actions. The Gibraltar killings could be accurately described as executions imo.
What’s an accurate description of shooting someone who is signalling with a white handkerchief when he was killed by a bullet that struck the back of his head.