Police in Ohio say a robbery at a pharmacy was stopped by an officer picking up security video from another robbery earlier the same night.

Surveillance video shows Dayton Officer Joshua Campbell entering the Walgreen Co. store Thursday morning and standing in line as a man appears to reach over the counter to grab money from the drawer.

Campbell says he thought: "This can't be happening right in front of me." He said the cashier's look seemed to say, "Oh no, not again."

The video shows Campbell grabbing and drawing a gun on the suspect and the two of them scuffling their way out the door.

Fifty-five-year-old Donald Cotten has been charged with robbery, aggravated robbery and assault on a peace officer. Court records don't name his attorney.