Police in Boulder, Colorado, responded to an active shooter situation at a King Soopers grocery store on Monday, and video footage from a witness at the scene shows multiple people lying on the ground.

A man was led out of the building in handcuffs and appearing to have blood on one leg, but it is unclear if he is a suspect in the incident.

What are the details?

The New York Times reported that a witness who "posted a live video from the scene shortly after the shooting began, said he heard about a dozen shots and saw three people who appeared to be wounded — two in the parking lot and one inside the supermarket."

The Boulder Police Department responded to the scene. The FBI announced in a tweet later, "At the request of the Boulder Police Department, FBI Denver personnel are assisting with an investigation into an active shooter situation at a King Soopers grocery store on Table Mesa Drive in Boulder."

Another man at the scene of the incident told KCNC-TV that his son-in-law and grandchildren were in the store when the shooting broke out, and that the suspect "shot the woman in front of them" in line at the pharmacy.

BPD was scheduled to hold a press conference at 7:45 p.m. ET, but it has been delayed.

This is a developing story and will be updated.