The police said that the gunman, Jeremy Webster, 23, did not know the victims.
A boy, his brother and his mother are among the victims of a shooting that police in Colorado say was prompted by a road-rage incident.
The shooting happened Thursday afternoon outside a dental clinic in Westminster, Colorado, north of Denver. Police found the victims in the parking lot of Comfort Dental suffering from gunshot wounds.
The boy later died. His mother and brother are in critical condition, police said. A fourth victim, a man unrelated to the other three, is expected to survive.
The gunman, Jeremy Webster, 23, did not know the victims, and the shooting appears to have "stemmed from a road rage," according to a news release from the Westminster Police Department. Police did not elaborate further on what might have pushed Webster to shoot the victims.
Webster has been charged with murder, assault and other charges. He had initially escaped, but was caught a few hours later. Police found his vehicle, a 2010 Toyota Corolla, about 40 miles away.
The owner of a nearby car shop told NBC affiliate KUSA that he heard at least seven gunshots and watched a man run down a sidewalk near the dental clinic.
"Like somebody was taking their time aiming at whatever they were shooting at," Shaun Licius told KUSA. "It wasn't like they were out just shooting targets."
James Sisneros said he had just dropped off his daughter at another dental clinic nearby when he heard gunshots. The nearby clinic was placed on lockdown as police interviewed witnesses, he told NBC affiliate KUSA.
For Sisneros, the shooting left him feeling uncertain.
"In today's world you never know where it's going to happen, whenever someone loses their trigger," he told CBS Denver.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)