Chicago police have warned their law enforcement counterparts across the nation that the release of body camera video showing the fatal shooting of a black man by officers may cause violence against law enforcement. 

According to a memo seen by FoxNews.com, authorities said making the video of Paul O'Neal's death public, coupled with the Aug. 9 anniversary of Michael Brown's death in Ferguson, Mo., "may cause an uptick in violence against police nationwide."

O'Neal, 18, was shot in the back on July 28 during a stolen vehicle investigation on Chicago's South Side. Three Chicago police officers have been relieved of police powers after a preliminary determination that they had violated department policy. 

Chicago's Independent Police Review Authority says that video from body cameras worn by two of the three officers who shot at O'Neal will be released at 11 a.m. CT Friday. The third officer's body camera was not recording at the time.

The video release conforms to a new city policy requiring the release of relevant video within 60 days of a police shooting. A former Chicago police officer is already awaiting trial for first-degree murder in the 2014 shooting of Laquan McDonald.

Police across the country have been on high alert since a sniper killed five officers during a Black Lives Matter protest on July 7. Three officers in Baton Rouge, La. were killed ten days later in apparent revenge for the shooting of Alton Sterling by police. 

FoxNews.com's Malia Zimmerman and The Associated Press contributed to this report.