The “potential activity alert” was first posted Monday by Yahoo News and verified to the Star Tribune on Tuesday as legitimate by a source who has seen the document.

The report said that some followers of the violent Boogaloo movement attended protests in early December at the Minnesota State Capitol “to identify escape points and defensible positions in the event violence occurred.”

Boogaloo members “scouted general law enforcement presence” at the earlier rallies, the report noted, and “identified law enforcement numbers. … They also identified law enforcement sniper locations and considered breaking into federal buildings for use as firing locations if fighting occurred.”