CANBERRA, Australia, Nov. 13 -- Authorities have warned that massive bush fires raging in two states will continue to pose a threat, despite "catastrophic" conditions easing.

About 150 fires are still burning in New South Wales (NSW) and Queensland, feeding off tinder-dry conditions.

As many as 50 houses were destroyed or damaged in NSW, however, no lives were lost, officials said. At one point, fires broke out in the suburbs of Sydney.

On Wednesday, blazes caused fresh emergencies in Queensland.

"The conditions are of concern to us," Premier Annastacia Palaszczuk told reporters.

The threat in NSW has been downgraded from catastrophic - the highest level - but officials urged residents to remain vigilant.

"We've got the worst of the...