About 90 law enforcement officers from multiple agencies broke up what they said was a rave party on public and private property in the Diamond Fork area of Spanish Fork canyon, an hour outside of Salt Lake City, Utah, at about 11:30 p.m. Saturday.

Armed with assault rifles, riot gear, and tear gas, the police used dogs to sweep the crowd for narcotics. At least one helicopter was used in the operation. The scale of the police response was apparently due to the ineffectiveness of a smaller force used in the previous raid. Video included at linked page.