Icy roads cause problems in Maryland, greater DC

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Snowsqualls that moved through the area Saturday evening caused whiteout conditions on Interstate 270 in Frederick and Montgomery counties and throughout the region, followed by snow-covered roads that made driving treacherous and slowed speeds on the highway to 20 mph or less on long stretches.

U.S. Park Police also warned drivers of icy conditions Sunday on the Baltimore-Washington Parkway.