BOULDER, Colo. (AP) — Boulder police are conducting an internal investigation after some of their officers confronted a black man who was picking up trash at his own residence.

The Daily Camera reports a release Monday from the department says an officer observed the man on Friday sitting behind a “private property” sign. The officer asked if the man was allowed to be there.

Authorities say the man told the officer he lived and worked in the building, and gave the officer an identification card, but the officer detained the man.

Warning: The following video capturing the incident contains explicit language.

The officer then made a request over the radio for additional assistance to respond, saying the man was uncooperative and unwilling to put down a blunt object.

Police found the object was a device used to pick up trash.

Police spokeswoman Shannon Aulabaugh could not provide more information.