Video shows a boat accelerating rapidly before flying through the air and hitting a sea wall in a dock in Key Largo, Florida.

“I have no idea. I saw a couple of guys flying off the boat,” said a man. Broward Sheriff Fire Rescue Battalion Chief Michael Kane spoke with 7News about the cause of the explosion, Friday evening.

The explosion left a gaping hole in the roof of the tour boat, which had been taking visitors out to view lava plunging into the sea. Hawaii County fire department battalion chief Darwin Okinaka ...