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National Security Agency leaker Edward Snowden is guilty of treason, the chairwoman of the Senate Intelligence Committee said Monday.

“I don’t look at this as being a whistle-blower,” Sen. Dianne Feinstein (D-Calf.) said. “I think it’s an act of treason.”

The whereabouts of Snowden were unclear Monday as authorities ramped up an investigation that could lead to his extradition and prosecution.