The Charlottesville chief of police announced his retirement on Monday, weeks after being criticized for how his department responded to a violent white nationalist rally this summer.

Police Chief Al Thomas' retirement will go into effect immediately, according to a press release from the city. The statement offered no reason for his resignation.

A former federal prosecutor released a report this month that heavily criticized law enforcement's response to the violent "Unite the Right" rally that took place on Aug. 12. and cost one counter-protester her life.

U.S. Attorney Tim Heaphy led the independent review, which was published after a monthslong investigation consisting of over 150 interviews, and concluded that law enforcement "failed to maintain order and protect citizens from harm," according to the Associated Press.

The report said Thomas deleted text messages related to the probe and made fellow officers fear retaliation for speaking with investigators. An attorney for Thomas disputed the allegations that Thomas deleted messages, the Associated Press reported.

City manager Maurice Jones will appoint an interim police chief later this week, according to the city's statement.