Four Chicago officers fired in July over allegations they helped cover up the fatal police shooting of Laquan McDonald have filed separate lawsuits challenging the decision, reports the Chicago Tribune.

The lawsuits by one sergeant and three patrol officers allege that the Police Board decision to fire them was unlawful. Police Superintendent Eddie Johnson, who recommended their firing, was named as a defendant as well.

The board’s 55-page decision concluded that Officers Ricardo Viramontes, Janet Mondragon, and Daphne Sebastian exaggerated the threat posed by 17-year-old McDonald in order to justify the actions of Officer Jason Van Dyke in the shooting.

Van Dyke is currently serving 6 ¾ years for second-degree murder and aggravated battery.