Two people were injured Sunday morning when a car crashed into a restaurant in the Sterling area of Loudoun County, authorities said.

The car ran into a Dunkin Donuts establishment in the 23000 block of Oak Road about 10 a.m., said Laura Rinehart, a spokeswoman for the county fire and rescue service.

One of the injured, a woman who appeared to be elderly, was a restaurant patron, Rinehart said. The other was in the car. It was not clear whether she was the driver or a passenger.

The site of the incident is northeast of Sully Road and Old Ox Road, and not far from the border with Fairfax County. Rescue personnel from both jurisdictions went to the scene.

The cause of the incident could not be learned immediately.

It came only a few days after a similar incident in the Clifton area of Fairfax County, involving the Clifton General Store, a town landmark.

No injuries were reported in that incident, reported Wednesday on Main Street in the historic town, but the building was shored up in the immediate aftermath to protect its structural integrity.

In addition to the General Store, the building involved houses the Main Street Pub and a florist shop.

Information about the cause of that crash was not available immediately. Crashes of cars into structures have been attributed in the past to a variety of causes, with medical emergencies often cited. In other instances, drivers have mistaken the gas pedal for the brake when entering or leaving a parking area.