Four people have died in a catastrophic fire, the second fatal blaze to kill multiple people in one state in less than a month.

The bodies were discovered in the burnt remains after emergency services extinguished the fire at Emerald in central Queensland, police said.

The blaze erupted before 7am on Thursday in the regional town about 270km west of Rockhampton.

A crime scene has been declared, with police and fire investigators launching a major investigation, a Queensland Police Service spokeswoman said.

Police have not released details identifying the four people killed as investigations into the cause of the fire get under way.

The horrific blaze comes less than a month after an alleged arson attack killed a mother and two young boys at Gladstone on October 15.

Jordana Johnson, 3

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