The Latest on an incident in which a police officer struck a woman in the face during an arrest (all times local):

11:30 a.m.

An Arizona police chief says an officer caught on video punching a woman in the face before arresting her reports the woman kicked him and kneed him in the groin before he hit her.

Flagstaff Police Chief Kevin Treadway also says Officer Jeff Bonar was detaining the woman because he knew about warrants for Marissa Morris' arrest. Treadway says police have determined the warrants were no longer active.

Treadway says he learned about the Wednesday afternoon incident after a police department employee saw a Facebook video of the incident taken by a bystander.

The video taken from the a home where Morris and her boyfriend were being evicted shows Bonar striking Morris but they are behind a railing and visible only from about the waist up.

Treadway says his department is conducting an internal affairs investigation and asking the Northern Arizona University Police Department to conduct a criminal investigation.

3:15 a.m.

Arizona police say an officer is being investigated after video surfaced that shows him punching a woman in the face during an arrest.

Flagstaff police say in a news release that officer Jeff Bonar has been placed on leave pending the probe.

They say "our agency is very concerned by what is depicted in this video."

Police say the incident occurred Wednesday as police arrested a "somewhat uncooperative" woman.

Video apparently shot by an onlooker and posted on Facebook shows her struggling with two officers.

At one point one of men punches her in the mouth area. She is eventually placed in a squad car.

There was no word on what prompted the arrest, but Arizona Republic reports it spoke with a man who identified the woman as his girlfriend and that police indicated she faced an arrest warrant.