DETROIT (AP) — A 52-year-old tree trimmer has been killed after a large branch he cut struck the aerial bucket platform he was standing in.

Detroit police say the man was about three stories up and cutting down a large tree in northwest Detroit about 9:45 a.m. Friday when he was knocked to the ground.

WDIV-TV reports that the tree trimming company was contracted by the city.

Police say the death is under investigation, but appears to be accidental.