A letter threatening to firebomb the offices of National Parks and Wildlife Service in Jindabyne is being investigated by NSW Police.
Warning: this story contains photos that may distress some people.
The threat came after the discovery of 11 horses shot dead in Kosciuszko National Parks as part of the NSW government's wild horse management plan.
Part of the handwritten letter, received by NPWS staff in Jindabyne last Friday said:
"…as a little act of retribution we plan to pay a visit… and firebomb your premises! Make sure you are all very careful over the next couple of weeks, we would hate you to get burnt."
NSW Police said officers from Monaro Police District had started an investigation and were urging anyone with information to contact Crime Stoppers.
'Disgraceful and unacceptable'
National Parks and Wildlife Service boss Atticus Fleming said additional security measures had been employed to protect staff.
"The threat to fire bomb a NPWS office is a criminal act, and should be condemned by all Australians," he said.
"It is a sad day for NSW when public servants are threatened with violence.
"Threats like this, and the ongoing threats of violence toward NPWS staff on social media, have no place in our society."
Environment Minister James Griffin said no one should be threatened for doing their job.
"This is disgraceful and unacceptable behaviour and it's been reported to NSW Police," he said.
"Anyone making such threats should expect to feel the full force of the law."
The plan to reduce feral horse numbers from 14,000 to 3,000 by 2027 was halted earlier this month after the discovery of the dead horses by members of the public.
Mr Griffin has ordered a review into the implementation of the plan, which will be completed on October 4.
