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The man accused of Victoria’s alleged koala massacre says he has been subject to a campaign of death threats after the incident that sparked a global online outcry.

But Keith Troeth – whose mother Judith Troeth was a senator for Victoria and parliamentary secretary for forestry in the Howard government – says he has done nothing wrong and will return to Victoria to face wildlife authorities, who he labelled "fascists".

A koala injured in the logged blue gum plantation at Cape Bridgewater. The animal was later euthanised after being found to have a broken arm. Credit:Helen Oakley

Investigators from Victoria's Conservation Regulator were still in the Cape Bridgewater area on Thursday, interviewing witnesses after at least 40 koalas were found dead and more than 140 were rescued from the former blue gum plantation after it had been logged and then bulldozed.