A Denver police officer was struck by a fire truck near the end of the Nuggets' victory parade.
The officer was transported to a hospital with serious injuries, according to 9News.
Minutes before the crash, fans had come over barriers and were pressed against the fire truck, with officers closely lined up along its sides.
The injured officer, who was wearing SWAT gear, was conscious after being hit.
Nuggets' players, including Nikola Jokic, number 15, who was riding on the rig from Station 15, got off and were transported by police to the civic center.