Police in Boulder, Colorado are responding to an active shooter situation at a King Soopers grocery store. Fox’s Denver affiliate reports:

A witness says they had just left the store after checking out and heard what sounded like fireworks. The witness says a guy was wearing tactical gear carrying an “AR-15 style weapon.” The witness says they ran back inside and told people about the shooter outside, ran into the back of the store and left through delivery entrance. The witness says they ran to the fire station down the street, it wasn’t open so they found a business to shelter in. The witness said the shooter was in the parking lot, and they were unclear if he entered the store.

Witness Daniel Douglas said he was in the store grabbing lunch.

“As we were waiting on the pizza and we started hearing gunshots. It sounded like someone was breaking the glass at first,” Douglas said. “We started screaming and hit the ground.”

Douglas said a lot of people were crying.

“My nerves are so racked right now I’m having a hard time talking,” he said.

This video shows multiple people on the ground.

DEVELOPING: Police are responding to an active shooter at a supermarket in #Boulder, Colorado. Graphic video shows multiple people injured.

(GRAPHIC VIDEO) pic.twitter.com/mKKCRV9Dm8

— YWN REPORTER (@YWNReporter) March 22, 2021

One man was led away in handcuffs by the police.

#BREAKING: Shirtless man taken out of Boulder King Soopers in handcuffs and loaded into ambulance — his involvement in the reported shooting is not clear.

WATCH LIVE COVERAGE on #CBSNDenver: https://t.co/PlRXKKVXcw pic.twitter.com/axF0U7LxYi

— CBSDenver (@CBSDenver) March 22, 2021

This is a breaking story. Updates will be posted as they become available.