Interstate 190 is closed in Worcester, the Massachusetts Department of Transportation said. The highway was closed at Exit 2.
Police were called to the scene about 3:40 p.m. for reports of a man on the highway with a gun, state police said. They noted the scene is secure and a man was in custody.
A large number of police officers were at the scene. It wasn't immediately clear if anyone was hurt.
Also Wednesday, Worcester police urged drivers to avoid I-190 because of heavy traffic. It wasn't immediately clear if that was related. They initially shared a post saying to avoid I-90.