UPDATE: 4 Pedestrians Struck By Car at Quarterfield Road, Route 100

UPDATE (Friday, 2:30 p.m.)—Three of the four people struck by a vehicle at Quarterfield Road and Route 100 have been released from the hospital, while one remains stable condition, Anne Arundel County police said Friday. 

Police said an initial investigation into the incident Thursday night revealed that four people may have been trying to cross Quarterfield Road without the help of a crosswalk or traffic light. They were struck by a Saturn Vue that was attempting to make a left from Quarterfield Road onto the ramp to Route 100 east. 

Police said pedestrian error was a "possible contributing factor" in the crash.

The Anne Arundel County Fire Department responded to the scene at 5:31 p.m. Thursday. The victims included two 16-year-old boys, a 20-year-old man and 19-year-old woman, police and fire officials said.

Police said the 16-year-old boys have been discharged, along with the woman. 

The 20-year-old man remains hospitalized at University of Maryland Medical Center in Baltimore. 

Anne Arundel County police confirmed that the driver of the car remained on the scene for first responders.