At least 10 people were killed in a shooting in a Colorado supermarket, TASS reports.

The police did not name the exact number of victims until they notified the relatives of the victims.

A spokesman for the city's police department had previously confirmed that one law enforcement officer had died as a result of the shooting. 

The shooter's motives are unknown, his identity has not been revealed yet. According to the head of the police department, the investigation of the incident may take several days.