A Tasmanian sawmiller has told of getting the fright of his life after finding bolt concealed in a sawlog received by Sustainable Timber Tasmania.
Bolts were found in logs delivered to Karanja Timbers and McKay Timbers on Tuesday, sourced from the Wentworth coupe in Tasmania's Central Plateau.
Wayne Booth, of Karanja Timbers, said it was fortunate the bolt was identified by a breaking down saw instead of a bench saw.
He said had the bolt made it to the bench saw, bits of saw teeth could have flown around at great speed and caused serious injury or death to anyone who was in the way.
Mr Booth said a hole had been drilled into a tree, the metal bolt placed within it, and then covered with silicone.
"So they knew what they were doing," he said.
"These people knew this could cause harm; that it could kill."
Activists attached to the Bob Brown Foundation earlier this year held protest action in the Wentworth coupe.
Foundation spokeswoman Jenny Weber said they had no knowledge of the alleged incident and called for a police investigation into it.
Deputy Premier Jeremy Rockliff said the government condemned any actions which could cause serious injury or even death in a workplace.
Greens leader Cassy O'Connor said she was suspicious that the tree-spiking was an attempt to demonise environmental activists and conservationists.
"The last time tree spiking was alleged, in 2012, it was found to be the work of a disgruntled industry worker," she said
"Every time tree spiking has come up in Tasmania, it has been from those opposing forest protesters."
Labor's resource spokesman Shane Broad said it was disappointing to see Ms O'Connor apportion blame ahead of a police investigation.
Forest Industries Association of Tasmania acting-chief executive Terry Edwards said he was not prepared to point blame at anyone yet but shot back at claims the action could have been committed by somebody linked to the industry.
"Why would someone within the industry want to destroy their own equipment?" he said.
"This is standard practice by the Greens and the environmental movement.
"They always blame a disgruntled forestry worker."