Five officers tied to the Freddie Gray case face internal discipline and three could be fired, The Baltimore Sun reports.

All five were charged criminally in connection with Gray's 2015 death.

The three who could be fired, sources with knowledge of the case tell the Sun, are Officer Caesar Goodson, who drove the van in which Gray suffered his fatal injuries; Lt. Brian Rice and Sgt. Alicia White.

Officers Edward Nero and Garrett Miller, who initially arrested Gray, could be suspended five days without pay. A sixth officer who was also criminally charged, Officer William Porter, faces no internal discipline.

The internal affairs investigation was carried out by Montgomery and Howard county police departments, who reported back to Baltimore police on May 12.

All six officers were charged with counts ranging from misconduct in office to, for Goodson, second-degree depraved heart murder. All officers charged in Gray's death were either acquitted in bench trials or saw their charges dropped by State's Attorney Marilyn Mosby. Gray's death set off several days of protests, followed by rioting and looting, leading to the declaration of a state of emergency in Baltimore City.

Rice, White, Nero and Porter are suing Mosby in federal court, alleging malicious prosecution.