Two people have been shot and a shooter may still be inside a high school in suburban Denver, according to multiple Denver news outlets.

Police and emergency vehicles are on the scene at Arapahoe High School in Centennial, about 15 miles south of Denver. Hundreds of students are being evacuated from the school.

The high school is in the Littleton School District, and only a few miles from the scene of previous mass shootings at the Aurora movie theater in 2012 and Columbine High School in 1999.

Denver Post reporter Ryan Parker says witnesses at the scene tell him that a student shot at least two students in the school cafeteria about 1 p.m. MT. Parker tweeted that Adam Jones, whose sister goes to high school, said students are still locked in rooms, and "very scared."

1st photo from #Arapahoe HS shooting scene. @CarlBilek in the area. School behind restaurant.
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From Newsite 7 News:

Arapahoe County Sheriff Grayson Robinson told CALL7 Investigator John Ferrugia that there has been a shooting at Arapahoe High School.

Robinson believes there are two victims and that the suspect is inside the school.

Hundreds of students have been evacuated safely.

There are reports that officers have made contact with the suspected shooter.

The Sheriff's office tweeted that parents should go to Shepherd of the Hills Church at 7691 South University Blvd.

A witness told 7NEWS she saw police in riot gear at the scene.

Arapahoe High School is at 2201 East Dry Creek Road in Centennial.

Littleton Public Schools and Elizabeth schools have been placed on lockdown. Cherry Creek Schools are on secured perimeter, which means the outer doors are locked. Douglas County Schools is on lockout, which means there is increased alert, all doors locked, visitors need ID to get in and children will be dismissed at normal time with increased patrols. All public schools in Aurora have been placed on lockdown as a precaution, according to Aurora PD.