TULSA, Okla. (AP) — There is insufficient evidence to pursue federal civil rights charges against a white former Tulsa police officer who shot and killed an unarmed black man, the Department of Justice said Friday.

U.S. Attorney Trent Shores announced the closure of the investigation into whether Betty Shelby willfully used unreasonable force against Terence Crutcher when she shot and killed him in September 2016.

"The Department of Justice devoted significant resources to this investigation to ensure that a thorough review was undertaken. Attorneys from both the Civil Rights Division and the...