A person of interest is in custody in Thursday’s shooting on the Upper West Side that sent subway riders scrambling to duck under seats, the NYPD said. Police have not released the name of the person in custody or what their relationship with the victim might be.

According to reports, the suspect was fired before the shooting, confronted his boss and fired at least six shots before fleeing into subway tunnels.

Several subway lines were disrupted on Thursday morning as the suspect in a shooting on the Upper West Side fled into the transit system, according to police. NYPD officials said a 47-year-old man was shot in the shoulder and leg by an unknown person at around 9:15 a.m., near West 68th Street and Columbus Avenue.