The Denver City and County Building was evacuated for two hours because of what police called a "credible threat". Deputy Police Chief Barb Archer said she doesn't know if it was an explosives threat or a threat to shoot people. Police swept the building two times and found nothing. Police have found a suspect they say is believed to be in crisis at this time and they are working to get that person help. Mayor Michael Hancock said there are an increasing number of threats against public officials and public buildings. He encouraged people to call the police if they see anything suspicious.