Iranian foreign minister on growing tensions: ‘We will not' act militarily

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An Iranian tanker is headed toward Greece after it was released from detention off Gibraltar because it had been stopped for violating European sanctions. Tehran said that any U.S. move to seize the vessel would have “heavy consequences.” NBC News’ Lester Holt reports from Iran where he spoke to Iranian Foreign Minister Mohammad Javad Zarif about the risk of war in the region.