Police in Boulder, Colorado, armed with protective gear and rifles were responding to reports of an active shooter at a King Soopers supermarket Monday afternoon.
It wasn’t clear whether there have been any injuries or fatalities.
The Boulder Police Department at 2:49 p.m. local time tweeted an alert for people to stay away from the area around the supermarket.
At one point, authorities were heard over a loudspeaker telling someone the building was surrounded and, “you need to surrender” and come out with hands up and unarmed.
A shirtless man with blood running down his leg was escorted out of the store in handcuffs by two police officers, a live TV feed showed. An ambulance pulled away from the store, apparently carrying the man.
Television helicopter video showed law enforcement vehicles and officers massing outside, including SWAT teams, and at least three helicopters on the roof of the store in the southern part of Boulder, about 25 miles northwest of Denver.
Officers had their guns drawn outside, and some windows at the front of the store were broken. TV footage showed officers helping two people to safety.
Colorado Gov. Jared Polis said he was monitoring the situation. “My prayers are with our fellow Coloradans in this time of sadness and grief as we learn more about the extent of the tragedy.”
The shooting comes six days after eight people – six of them women of Asian descent – were killed by a gunman at three spas in Atlanta and a nearby county.
Contributing: The Associated Press