Three people have been rushed to hospital in a critical condition after they were shot at a Colorado school, police have said.
Jefferson County Sheriff's Office said a gunman opened fire just after noon local time at Evergreen High School, located 28 miles southwest of Denver.
JeffCo emergency communications said there were reports of 'an active assailant in the area' at 12.40pm MST.
'If you have children who attend the school, please do not go directly to the school as it is still an active scene,' they wrote in an alert shared on X.
The sheriff's office later said that 'three people were transported to the hospital from Evergreen High School, all in critical condition'.
