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Tom Ridge, the 43rd governor of Pennsylvania and the first U.S. Secretary of Homeland Security, was transferred by ambulance to a hospital in the Washington D.C. area this morning.

Ridge suffered a stroke at his residence in Bethesda, Maryland, but was conscious when he arrived at the emergency department.

Ridge later underwent a successful procedure to remove a blood clot. He currently remains in critical yet stable condition.

This is a developing story.