PHOENIX —  Charges may be forthcoming after a fight involving a Higley Unified School District bus driver and three teenagers that was captured on a security video, authorities said.

Gilbert police released a copy of a district videotape Thursday that shows a Williams Field High School girl and bus driver Kim Sullivan in a disagreement last Friday that escalates over the course of 15 minutes.

Click here to watch the video.

The tape shows both are verbally combative with each other.

Later, Sullivan takes the girl's cell phone and calls for security and a student on the bus called 911 after the bus had stopped and the shoving match began, the video shows.

Police are investigating three teens and Sullivan, 54, in connection with the situation.

Higley officials have sent a letter home to parents saying they are conducting their own investigation to determine what disciplinary measures to take.

Click here to watch the video and read more on this story from MyFOXPhoenix.com.