According to the Associated Press, police said in a statement Tuesday that while the circumstances are not yet known, the video is disturbing. Police say they have not yet identified the officer, but he will be placed on administrative duty once identified, until the investigation is complete.
Missouri Gov. Jay Nixon plans to deliver his annual State of the State speech on Jan. 19.
The speech is given each year in the House chamber before a joint legislative session. Governors use the speech to outline their priorities, highlight past polices and present their proposed state budget.
Policymakers estimate that Missouri is facing a $500 million budget deficit.
Nixon's speech is scheduled to start at 7 p.m.
Read last year's state of the state address here for some perspective on where Missouri was on the issues a year ago.