Ten people have been killed, including a police officer, in a mass shooting at a Colorado grocery store.
Boulder Police tweeted for people to avoid the area due to the active shooter situation inside the King Soopers store and urged everyone not to post about their operations.
A news helicopter captured the moment a man was led away in handcuffs and was drenched in what appeared to be blood. Police say one person is in custody over the incident but haven't released any more details.
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A witness told Fox News: "We were standing in our restaurant. We knew it was really serious because police were running with machine guns.
"It's shocking. This is our neighbourhood centre. You didn't think it would happen in Boulder, Colorado."
Another witness added: "Boulder feels like a bubble, and the bubble burst...It doesn't feel like there's anywhere safe anymore sometimes. And this feels like the safest spots in America, and I just nearly got killed for getting a soda and a bag of chips."
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Other people who watched the horrifying situation unfold described the gunman was dressed in tactical gear and moved 'methodically' through the car park and unloaded several rounds of ammunition.
He then proceeded to enter the King Soopers store and fire off more bullets.
Police have paid tribute to Officer Eric Talley, 51, who was killed in the mass shooting. He was one of the first officers on the scene when the attack unfolded and had been with the department for more than 10 years.
Colorado Governor Jared Polis said: "Like my fellow Coloradans, I am closely watching unfolding events at King Soopers in Boulder.
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"My prayers are with our fellow Coloradans in this time of sadness and grief as we learn more about the extent of the tragedy."
King Soopers supermarkets has issued a statement said it is 'horrified and deeply saddened by the senseless violence'.
"The entire Kroger family offers our thoughts, prayers and support to our associates, customers, and the first responders who so bravely responded to this tragic situation," the company said on Twitter.
Featured Image Credit: PA