The deadly fires have killed at least 110 people.

The death toll makes the blaze Hawaii's worst natural disaster, surpassing a tsunami that killed 61 people in 1960, a year after Hawaii became a US state.

Aerial video showed pillars of smoke rising from block after block of Lahaina, the largest tourist destination on Maui and home to multiple large hotels.

Four fissures have now opened up on the mammoth mountain, which burst into life on Sunday for the first time in almost 40 years.