BURTONSVILLE, Md. — Two women and a man were killed and another person was in serious condition after an SUV crashed into the back of a snowplow in Maryland on Monday evening, police said.

The crash happened on northbound Route 29 in Burtonsville, about 10 miles (16 kilometers) northeast of Washington, D.C., around 6:45 p.m. Monday when a black Cadillac SRX hit the back of a white Peterbilt snowplow dump truck, Montgomery County Police said in a news release Tuesday. The crash happened hours after a snowstorm dumped about 6 inches (15 centimeters) of snow in that area of Montgomery County, according to reports to the National Weather Service.

When officers arrived, they determined that three of the people inside the Cadillac were dead. The fourth person was taken to a hospital with serious injuries, police said. The plow driver wasn't hurt and remained on the scene.

Police identified the three people killed in the crash as Shawde Ajee Nayonta Wicks, 27, of Clinton; Natasha Ann Hunter, 41, of Baltimore; and Gary Eugene Early, 52, of Baltimore. The surviving passenger was listed in serious condition, police said Tuesday afternoon, .

The cause of the crash is under investigation and police said it may take several weeks.