Cops revealed one of the injured has been identified as a suspect. Three others, police said, are in critical condition. The rest "are believed to have non-life-threatening injuries."
"As far as what led up to this altercation that resulted in the shots being fired, that’s still under investigation at this time," a police spokesperson said. "It did occur in the area where we had largest gathering of folks celebrating during the night."
Others were seen shooting off fireworks to commemorate the team's first-ever title.
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Inside the arena, meanwhile, Nuggets players couldn't have been happier to finish off their championship run ... the guys doused each other in booze in the locker room -- and at one point, series MVP Nikola Jokic tossed Jamal Murray into a pool.
The city is expecting to host a championship parade for the team on Thursday.