A day after New York attack which killed 8 people, 3 persons were killed and one got injured in a shooting at Walmart in Colorado on Thursday.
Thornton Police said "it was not an active shooter" but advised people to stay away from the area.
"Shooting just occurred at Walmart, 9900 Grant St, multiple parties down. Please stay away from the area," Thornton Police Department said in an earlier tweet.
A large number of police vehicles were seen in the parking lot of the Walmart.
Local news channels said a few ambulances were rushing to the Walmart, describing the scene as "chaotic".
A press conference by the police department was expected soon when the report last came in.
Earlier on Wednesday, a man in rented pickup truck drove onto a busy bicycle path near the World Trade Centre memorial, killing at least eight people and injuring several others in what the mayor called “a particularly cowardly act of terror.”
The 29-year-old driver was shot by police after jumping out of the truck with what turned out to be a fake gun in each hand, officials said. He was taken into custody. His condition was not immediately disclosed.
At least eight people were killed and 11 others injured in Lower Manhattan after a gunman in a truck plowed through a busy bike path, an incident the US termed as an “act of terrorism”.