Police were conducting car-by-car searches at a Colorado music venue early Friday after three people were shot following a rap concert.
The victims were gunned down while they sat in a white SUV in the parking lot of the Red Rocks Amphitheater, a near-10,000-capacity venue built into the mountain range 10 miles from Denver.
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The shooting happened at 10:30 p.m. local time Thursday (12:30 a.m. ET Friday), and came just minutes after the end of a concert featuring the popular hip-hop acts Nas, Flying Lotus and ScHoolboy Q.
According to Jacki Kelley, public information director for Jefferson County Sheriff's Office, the victims' vehicle drove away from the scene after the incident and stopped at an intersection in Denver, at which point police were called and the three people were transferred to the hospital.
Their injuries were not believed to be life-threatening, Kelley told NBC News.
No shooter had been apprehended by 1:40 a.m. local time (3:40 a.m. ET) but Kelley said the national park surrounding the amphitheater had been sealed off, and anyone in a car would have to come through the main gate.
"Hundreds of police officers are involved in the search backed up by a helicopter," she said. "Anyone leaving the national park would have to go through the gate or walk through the mountains on foot."
Police set up a tip-off telephone line as they believe the incident may have had numerous witnesses.