The ABC understands a Large Air Tanker has crashed while fighting a blaze in southern NSW.

In a statement, the NSW Rural Fire Service (RFS) said "contact had been lost with a Large Air Tanker which was working in the Snowy Monaro area".

"Local ground crews indicate the aircraft may have crashed.

"A number of helicopters are in the area carrying out a search."

There is an emergency warning in place for a blaze burning towards Adaminaby, in the Snowy Monaro region.

"No further information is available at this time," the RFS statement read.

AusAnon