Now Playing: June 24, 1985: No Survivors in Air India Crash

Now Playing: Aug. 12, 1985: Japan Airlines Crash

Now Playing: Police officer saves toddler from getting hit by a car

Now Playing: Mosul's landmark Great Mosque of al-Nuri and leaning minaret destroyed

Now Playing: Brussels Central Station reopens after explosion

Now Playing: Adele surprises London Fire Brigade for tea time

Now Playing: Trove of Nazi artifacts found in Argentine home

Now Playing: Meteors streak through sky against Aurora Australis

Now Playing: Explosion at Brussels train station, suspect shot

Now Playing: 79 presumed dead in London high-rise fire, police say

Now Playing: Witnesses describe the scene after a deadly terrorist attack at a London mosque

Now Playing: Witnesses describe horror at scene of London mosque attack

Now Playing: Theresa May on attack outside mosque: 'Evil of this kind will never succeed'

Now Playing: Timeline of Otto Warmbier's saga in North Korea

Now Playing: Vehicle collides with police car on Champs-Elysees: Police

Now Playing: Officials open terror investigation in Paris vehicle collision

Now Playing: Brexit: UK prepares to leave the European Union

Now Playing: London police investigating incident of collision with pedestrians

Now Playing: What's next in US withdrawal from Paris Climate Agreement

Now Playing: Witnesses describe the London attack