Law enforcement officers were searching for a gunman Friday after three people were shot and wounded at the end of a rap concert at the popular Red Rocks outdoor amphitheater in the foothills west of Denver.
The victims' injuries were not life-threatening, Jefferson County sheriff's spokesman Mark Techmeyer said. Their names were not released.
No arrests had been made. The shootings did not appear to be random, Techmeyer said.
Deputies were investigating a report that a man was seen with a rifle, but Techmeyer called that information "pretty sketchy."
The shootings occurred about 10:30 p.m. Thursday near the end of a performance by Nas, Schoolboy Q and Flying Lotus.
The injured people were in a white sport-utility vehicle and drove themselves from Red Rocks to a Denver intersection about 15 miles away, but it was not clear why, Techmeyer said. They were eventually stopped by Denver police and taken to a hospital.
Investigators did not know if more people had been in the SUV before police stopped it, he said.
Techmeyer didn't know how many people were at the concert, but he said investigators stopped and questioned each car as it was leaving.
Traffic was chaotic and slow, but "we had a shooter out there," he said.
Witnesses were being interviewed until the early morning hours Friday.
The Red Rocks amphitheater and surrounding park are popular with joggers and sightseers. Most of the park had reopened Friday morning, but the area of the shooting remained sealed off.