TMZ Sports has obtained the 911 call made after Paul Millsap's Rolls-Royce collided with a motorcycle this week -- with the witness describing a fiery scene as people tried to help the injured biker.
We broke the story ... the Atlanta Hawks superstar was driving his Rolls on Monday around 6:30 PM when a biker slammed into the front of the vehicle.
A woman called 911 and told the operator, "Oh my gosh, there's fire. It just happened. There's somebody lying on the ground."
"I heard a crash ... and I saw something fly out.