Now Playing: Hawaiian authorities warn Kilauea volcano could erupt

Now Playing: Lava flows from Kilauea volcano during 'blue hour'

Now Playing: Hawaiian Volcano Spews Lava Into Sea

Now Playing: Lava snakes through trees as Kilauea volcano erupts

Now Playing: Handcuffed man leaps over courthouse railing

Now Playing: Vice President Mike Pence swears in Richard Grenell as Ambassador to Germany

Now Playing: 9 police officers recovering from injuries after suspicious blast sparks blaze

Now Playing: Police officer under probe after video appears to show him kicking suspect

Now Playing: 9 members of the Puerto Rican National Guard killed in cargo plane crash

Now Playing: Mother of stolen baby testifies in trial against accused kidnapper

Now Playing: Heart transplant survivor meets donor's parents for the first time

Now Playing: 11 million people at risk in fourth day of dangerous storms

Now Playing: Trump says he reimbursed his personal lawyer for money paid to porn star

Now Playing: Investigators were tracking phone calls by Trump lawyer before raid: Sources

Now Playing: 1 person fatally shot during fight at Nashville mall: Police

Now Playing: Twitter urges 330M users to change their passwords immediately

Now Playing: At least 8 cars damaged in parking-deck collapse

Now Playing: 'Golden State Killer' survivor was 13 when attacked

Now Playing: 'Golden State Killer' survivor recalls learning of suspect's arrest

Now Playing: Daughter seeking Trump pardon for mother says Kim Kardashian West spoke to WH