A police officer was among six people killed during shooting at a grocery store Monday in Boulder, Colorado, according to reports.
A suspect has been arrested, although his identity is not yet known.
A possible second suspect was reportedly on the phone with police following the shooting, and SWAT Team members were reportedly descending on a second location on 17th Street in Boulder.
Some reports said some hostages may have been taken.
Four or five additional victims needed to be treated at scene after police and the suspect exchanged gunfire, according to reporter Eric Wasserman.
There was no official confirmation of the exact number of casualties as the chaos continued to unfold.
The suspect was reportedly armed with a rifle, possibly an AR-15.
At least one man was taken into custody, although it was unclear whether this individual was the gunman.
BREAKING: Police officer, 5 others reportedly killed at Colorado store
Four or five additional victims needed to be treated at scene after police and the suspect exchanged gunfire, according to reporter Eric Wasserman.
He survived a shootout with police.