Neighbours said they had been told the men were killed by the explosion of a P lab.
At least one of the deceased men was known to some locals but those who knew him declined to comment on his death.
Police said the names of the men would not be released until their families had been informed.
While most meth labs are found in houses, garages or sheds in residential areas, police have uncovered some in less obvious places, including caravans, shipping and storage containers, motels and baches. A lab was also found in a car boot.