ROANOKE, Va. (AP) -- Police believe the shooter who killed one person and himself at a rail car manufacturing company in Roanoke was an employee or ex-employee of the company.

Roanoke Police Chief Tim Jones said at a news conference Tuesday that the shooter took his life after shooting several people at FreightCar America, located in an industrial area near downtown Roanoke. He says the identities of the victims and suspect aren't yet known.

He says one witness hid inside a bathroom during the shooting and they are waiting to interview him.

Roanoke police searched buildings after the shooting. Around noon, police posted on social media that the search was completed and nothing suspicious was found. Police say the road will remain closed while they work at the scene.

Carilion Roanoke Memorial Hospital said in a statement on Tuesday that they've received three patients from the shooting. One of the patients is in serious condition, and the other two are in fair and good condition, respectively.