Authorities say they recorded a Baltimore man saying a rifle he was selling was loaded because he was "getting ready" to shoot police after an officer was acquitted on charges in the arrest of a black man fatally injured in police custody.

Robert Owens is charged with possession of a firearm by a felon. An affidavit filed in U.S. District Court states that Owens sold an informant a rifle Monday, the same day Officer Edward Nero was acquitted on charges stemming from Freddie Gray's arrest. The affidavit states Owens mentioned it was loaded, saying "I was getting ready to use it to shoot some cops."

Owens waived his right to a hearing and agreed to detention.