BREAKING: Shots fired at STEM school in Colorado

Note: Police received reports of shots fired at 1:50 local time in Highlands Ranch, Colorado on Tuesday. Responding to the scene (details below) they eventually apprehended two suspects. Initial reports were unclear on the number of victims, but that has since been updated. Updates are at top of post followed by the original full story. There is a live feed from Denver 7 at the end of this article.

UPDATE (18:04 ET): Four of the victims in serious condition, one was in fair condition at Littleton Adventist Hospital, one victim in good condition at Children's Hospital. Two victims were at Sky Ridge Medical Center, conditions unknown.

UPDATE (17:45 ET): Video of emotional first-hand account from parent of a student who was evacuated. Douglas County Undersheriff Holly Nicholson-Kluth states suspects "were caught by officers running into the schools." (VIDEO)

UPDATE (17:36 ET): Sheriff's office reports that 7 or 8 students injured in the shooting. Does not include shooters.

ORIGINAL STORY:

The FBI and local police are on scene, with more emergency vehicles arriving every minute, at a large school with over 1,800 students in Colorado, where first report of shots fired came in at around 1:50pm in Highlands Ranch, Colorado.

A medical helicopter was seen arriving in the moments before this article was published. At the time of this article, police consider the scene "active" and "unstable."

ABC News, Fox News Channel, and various other outlets report that there are "multiple" victims, but nothing specific. Two suspects are reportedly in custody.

The children's hospital is very nearby, and confirms to local news that they have received emergency vehicles from the scene, but have not reported on what the status is.

Multiple victims were also taken to the medical helicopter in the live broadcast (below) in the last few minutes.

Updates from the Sheriff's Office of Douglas County have been released on Twitter.

Some students are still in the lockdown by police within the school and have not been released to parents.

Channel 7 in Colorado is live on the scene. You can watch the coverage below.