There was a case, some many years ago, where police were trying to
find an armed suspect on the loose in a neighborhood. A plumber, with
pipe wrench, was emerging from under neath a tight crawl spaced house
and was shot dead, while half of his body was still under the house.
No warning, of any kind, from the police, at all. I can't imagine how
the plumber could possibly look threatening in his obvious crawl
position and he had no clue of the ongoing suspect search.