Bomb Threat Empties Colorado Capitol After Broncos Parade

A bomb threat forced the evacuation of the Colorado State Capitol in Denver Tuesday afternoon — after hundreds of thousands of people packed the area to celebrate the Denver Broncos' Super Bowl victory, authorities told NBC News.

The threat turned out to be unfounded, authorities said.

State Patrol Trooper Nate Reid confirmed that a bomb threat had been received Tuesday afternoon. He said authorities swept the Capitol before determining after about three hours that the threat wasn't credible.

NBC station KUSA reported that the evacuation began after 3 p.m. (5 p.m. ET).

More than 1 million people rallied at nearby Civic Park and in the downtown area earlier Tuesday afternoon for the Broncos' Super Bowl parade, but KUSA reported that many of them had already left by the time the Capitol was evacuated.