At least 22 people have been injured after a volcanic 'lava bomb' the 'size of a basketball' came crashing down onto an ocean tour boat in Hawaii.
Screams and shouts can be heard before passengers are plunged into darkness and run for cover.
Moments earlier lava had oozed into the sea and sent molten rock raining through the roof of the boat named 'Hot Shot'.
The sight-seeing vessel was showered with smaller bits of volcanic debris and cinder from the explosion, which also sent rocks and debris flying towards the 49 passengers.
Eyewitness video footage shows a towering cloud of steam and ash billowing into the sky, followed by the glow of red-hot embers and flashes of lightning.
It is being described as the worst casualty incident to date from the ongoing eruption of the Kilauea Volcano.