A lava bomb hit a tour boat this morning in Hawaii, injuring 23 people.

The Hawaii County Fire Department says the lava punctured the boat's roof and the boat returned to Wailoa Harbor.

Hilo Medical Center confirmed 13 passengers were treated at the hospital, and another 10 passengers with superficial injuries were treated on arrival at Wailoa Harbor.

Of the 13 injured passengers, four were taken by ambulance to Hilo Medical Center.  

One woman in her 20s was in serious condition with a fractured leg while three passengers were in stable condition.

The fire department says lava bomb, or flying chunk of molten rock, left a large hole in the boat's roof and a railing was also damaged.

Hawaii's Kilauea volcano erupted in early May, sending a smoldering flow of lava into residential areas on the Big Island.

Kilauea was still erupting lava as of yesterday.

[Source:CNN]