(CNN) Four Chicago police officers have been fired for covering up the 2014 fatal shooting of Laquan McDonald, a black teenager, the Chicago Police Board said Thursday.

The board said it ordered Sgt. Stephen Franko, Officer Janet Mondragon, Officer Daphne Sebastian and Officer Ricardo Viramontes to be "discharged from the Chicago Police Department."

In its ruling, the board concluded the officers violated their "duty by describing the alleged threat posed by Mr. McDonald in an exaggerated way, while omitting relevant facts that support the opposite conclusion. The overall impression based on this selective telling is both misleading and false."

"Indeed, taken on their face, the officers' accounts depict a scene in which Mr. McDonald was the aggressor and Officer Van Dyke the victim—a depiction squarely contradicted by reality. Put simply, the officers wanted to help their fellow officer (Jason Van Dyke) and so described the incident in a way to put him in the best possible light," the board wrote.

The board is an independent civilian body that decides police disciplinary cases. A spokesman for the police union, did immediately return a telephone call and an email from CNN seeking comment.

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