Now Playing: Trump says U.S. military solutions for North Korea are ‘locked and loaded’

Now Playing: North Korea promises ‘thousands-fold’ revenge against US over sanctions

Now Playing: Trump doubles down on North Korea warnings

Now Playing: Trump administration denies war with North Korea is close

Now Playing: Top South Korean official: U.S. government moved from ‘strategic patience’ to ‘strategic confusion’

Now Playing: Tensions mount between the US and North Korea

Now Playing: Officials clear American in London bus incident

Now Playing: More zoo animals rescued from Aleppo

Now Playing: Protesters on the streets ahead of election result

Now Playing: Guam residents react to North Korea missile threat

Now Playing: Trump issues new warning for North Korea

Now Playing: Trump on Kim Jong Un: ‘He’s not going to threaten the United States’

Now Playing: Dust devil wreaks havoc on French beach

Now Playing: Migrants flee after landing boat on Spanish shore

Now Playing: North Korea: ‘Only absolute force’ can work on Trump

Now Playing: Trump’s threat a ‘load of nonsense’: North Korea military

Now Playing: Hurricane Franklin approaches Mexico

Now Playing: Japan marks 72nd anniversary of atomic bombing of Nagasaki

Now Playing: Driver mows down group of soldiers in Paris suburb

Now Playing: Trump faces backlash for refusing to call out hate groups for Charlottesville violence