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epa06133221 (FILE) - A handout file photo made available by the US Department of Defense (DoD) on 09 August 2017 shows an aerial view from above US Naval Base Guam (NBG) showing Apra Harbor with several navy vessels in port, in Guam, 05 March 2016. According to North Korean state media on 09 August 2017, the North is considering a potential preemptive strike with medium-to-long-range strategic ballistic missiles on the US Pacific territory of Guam, where US tactical bombers are based. The threat follows US President Donald J. Trump's warning to Pyongyang that any threat to the USA 'will be met with fire and fury like the world has never seen.' The exchanges marked rising tensions between the two countries.  EPA/US NAVAL BASE GUAM/JEFFREY LANDIS HANDOUT  HANDOUT EDITORIAL USE ONLY/NO SALES
epa06133221 (FILE) - A handout file photo made available by the US Department of Defense (DoD) on 09 August 2017 shows an aerial view from above US Naval Base Guam (NBG) showing Apra Harbor with several navy vessels in port, in Guam, 05 March 2016. According to North Korean state media on 09 August 2017, the North is considering a potential preemptive strike with medium-to-long-range strategic ballistic missiles on the US Pacific territory of Guam, where US tactical bombers are based. The threat follows US President Donald J. Trump's warning to Pyongyang that any threat to the USA 'will be met with fire and fury like the world has never seen.' The exchanges marked rising tensions between the two countries.  EPA/US NAVAL BASE GUAM/JEFFREY LANDIS HANDOUT  HANDOUT EDITORIAL USE ONLY/NO SALES

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    Why did NK threaten tiny U.S. island of Guam?

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Why did NK threaten tiny U.S. island of Guam?

North Korea threatened to attack Guam with ballistic missiles. CNN's Ivan Watson reports.

Why did NK threaten tiny U.S. island of Guam?

North Korea threatened to attack Guam with ballistic missiles. CNN's Ivan Watson reports.