Windows and doors of the City and County Building in downtown Salt Lake City were boarded up on Wednesday.
The warning came days after supporters of President Donald Trump stormed the U.S. Capitol Building during a violent riot in which five people died.
The Utah Highway Patrol is also beefing up security at the Utah State Capitol. The Salt Lake City Police Department is working with federal and state agencies on safety plans for Utah's capital city, and warned that it would not tolerate any violence.
Salt Lake County Mayor Jenny Wilson's office reports that right now, they have not received any indication city or county buildings will be the target of any protests. Plans are still in the works, but the county building will have extra security in the coming days, Mayor Wilson's spokesman Chloe Morroni said.