A Charles County sheriff's deputy was hospitalized Monday after being involved in a three-car accident on Crain Highway that occurred after motorists tried to get out of the way of an ambulance on an emergency run, authorities said.

The driver of one of the vehicles suffered injuries that were not life-threatening, and the other did not require hospital treatment, said Charles County Sheriff's Office spokeswoman Kristen Adkins. The deputy was released from the hospital Monday after being treated for unspecified injuries, she said.

At 3:16 p.m., a 1999 Chrysler sedan was traveling south on Crain Highway just north of Billingsley Road when the driver, Deborah Ann Dixon, 49, of Waldorf, stopped for an ambulance merging onto southbound Crain Highway from Billingsley Road with its emergency equipment activated, Adkins said.

A 2003 Toyota sedan driven by Dawn Long Talley, 36, of La Plata, was traveling behind Dixon's vehicle and also stopped.

Sgt. Jeffrey Holter, 36, was on routine patrol duty traveling in his county patrol vehicle behind Talley's vehicle. He attempted to stop but struck the rear of Talley's vehicle, which then struck the rear of Dixon's vehicle, Adkins said.

Dixon and Holter, a 14-year veteran of the department, were transported to Civista Medical Center in La Plata for treatment. Talley was not injured, Adkins said.

Holter did not have the emergency equipment on his cruiser activated at the time of the accident and was not responding to a call for service. Traffic was backed up for about an hour. No charges have been filed. The investigation of the crash was continuing.