A man was found dead inside a car partially submerged in a pond in Bowie Saturday morning by the Prince George’s County Fire and Emergency Medical Servcies Department.

Firefighters found a 2003 Honda Accord overturned in a water retention pond near the off-ramp of eastbound Route 50 by Route 197 in Bowie about 8 a.m., said spokesman Mark Brady, with the passenger area partially underwater.

Ibrahim Sow, 29, of Bowie, the driver of the car, was pronounced dead at the scene by the Medical Examiner’s Office, according to the Maryland State Police, College Park Barrack.

The incident apparently happened overnight, Brady said, because water had begun to freeze around the car.

The cause of the accident is still under investigation by police, but preliminary findings by a crash team suggested that driver impairment may have contributed. No other vehicles were involved in the collision.

The State Highway Administration closed the ramp almost entirely during the investigation Saturday morning, but the right shoulder was available for traffic passing by.