Some three million people have been left without power after violent storms hit the region around the US capital, Washington DC.
The storms swept from the Midwest states to the region around Washington, packing winds of up to 80mph (130 km/h).
The power outages left many sweltering without air conditioning amid a record-breaking heatwave.
At least 12 deaths have been linked to the storm, officials say.
The storm is locally referred to as a "derecho" - a violent, straight-lined windstorm associated with a fast-moving band of severe thunderstorms.
It left behind felled trees, streets littered with fallen branches and downed power lines.
Washington's transit authority said most metro lines were back to normal service after the storm disrupted service on all lines during Friday night. But many Metrobus routes were subject to detours or delay due to downed trees and power lines.
Amtrak suspended services from Washington to Philadelphia.
The heatwave has seen all-time records smashed with temperatures of 104F (40C) in DC.
It was set to continue, said the National Weather Service - and it warned that another round of severe weather was possible.
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