A gunman opened fire at a manufacturing facility in northern Maryland on Thursday, killing at least three people and critically wounding another, a Maryland county sheriff said.
The assailant, who was not immediately identified, was taken into custody after he was wounded in an exchange of gunfire with a Maryland state trooper, a Washington County Sheriff's spokeswoman said. Both the suspect and trooper were taken to a local hospital with gunshot wounds.
The spokeswoman said there was "no active threat" to the community but declined to speculation a motive for the shooting.
"My understanding is there are potentially three people killed," Maryland Governor Larry Hogan told reporters. Hogan said a state trooper was struck by a round fired by the shooter.
A Colombia Machine spokesperson said that the company was cooperating with authorities in their probe into the shooting but declined to say how many employees were at the site when the shooting happened.
The company supplies concrete manufacturing equipment to customers in over 100 countries, according to its website.
The Baltimore office of the US Bureau of Alcohol, Firearms and Explosives said on Twitter it was sending agents to the scene in Smithsburg, in northern Maryland near the Pennsylvania state line.
"We are actively monitoring the mass shooting in #Smithsburg right now, and our office is in contact with officials on the ground," US Representative David Trone of Maryland said on Twitter.