Residents of Ohio and Pennsylvania were cleaning up Wednesday after severe thunderstorms Tuesday evening left thousands without power and caused three deaths.

A severe storm knocked out power for over half a million people in Pennsylvania and Ohio, causing widespread destruction and resulting in two fatalities from electrocution. Authorities warned of more severe weather,

At least four people were killed in Pennsylvania on Tuesday and hundreds of thousands of customers were without power after severe weather that had torn across the High Plains and Upper Midwest earlier this week pushed into the Northeast and Canada.