A shooting at a Walmart in Chesapeake, Virginia, Tuesday night left multiple people dead and injured, police said.

Officers responded to the store less than an hour before closing around 10:12 p.m. and found the victims and evidence of a shooting, Chesapeake Police public information officer Leo Kosinski told CNN.

Details on exactly how many people were killed or injured likely won’t be available until later Wednesday because investigators were still sweeping the store overnight to look for additional victims or people who may be hiding, Kosinski said.

Investigators believe the shooter was an employee or former employee of the store who opened fire on other employees in a break room.

The Washington, DC, field office of the Bureau of Alcohol, Tobacco, Firearms, and Explosives is assisting local police in the investigation

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