Live Updates: 2 victims, suspect "down" in shooting near Army base in Frederick, Maryland

Police in Frederick, Maryland responded to an active shooter on Tuesday and said there are at least two victims. They said the suspect was "down," and two law enforcement sources told CBS News the suspect is no longer a threat.

The shooting happened at an address where a concrete business is located, about 4 miles from Fort Detrick. It was unclear if the suspect had approached the Army base. Jeremy Mutschler, director of marketing for Nicolock Paving Stones, said that his understanding is that the shooting was near the company's Frederick location but not at the business itself.