Australian Prime Minister Scott Morrison issued a rare public apology on Friday and cut short a Hawaiian vacation in response to mounting public anger after two volunteer firefighters were killed battling bush fires sweeping the country's east coast.

Australia has been fighting wildfires across three states for weeks, with blazes destroying more than 700 homes and nearly 3 million acres (1.2 million hectares) of bush land.

The death of the two firefighters overnight when their fire truck was struck by a falling tree as it traveled through the front line of a fire brought the fires death toll since the start of October to eight. Six more firefighters were seriously injured on Thursday.