Emergency officials closed Union Station in downtown Denver for more than an hour on Tuesday due to an investigation of a suspicious package. It turned out to be an empty box. That's according to Denver police, who said the package was found at the transit center after 5 p.m. and by 6:30 p.m. things were back to normal after it was determined the package was not a concern.

Service on several train lines were affected by the situation for over an hour, too. Notices went out on RTD's social media that trains were not departing from or arriving at Union Station. That included the A Line, B Line, G Line and N Line. Shuttle buses were called in to get passengers to their destinations.

By 6:30 p.m. the train service was back to normal.