A major winter storm caused dangerous travel conditions and delays across the central and eastern U.S., including Washington D.C., as snow piled up.

A deadly winter storm is pummeling Washington, DC, and the mid-Atlantic Monday after causing hundreds of crashes and flight cancellations and knocking out power to hundreds of thousands in the central United States over the weekend.

Every state from Kansas to Delaware logged at least one report of 10 inches or more of snow. At one point, some 70 million Americans were under winter storm warnings.