U.S. intelligence agencies believe that Iran is prepared to launch terrorist attacks inside the United States in response to perceived threats from America and its allies, the U.S. spy chief said Tuesday.

Director of National Intelligence James R. Clapper Jr. said in prepared testimony that an alleged Iranian plot to assassinate the Saudi ambassador in Washington that was uncovered last year reflects an aggressive new willingness within the upper ranks of the Islamist republic to authorize attacks against the United States.

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