Worksafe says it is investigating an incident at a north Canterbury property on Monday involving a forestry worker.
A person was flown to Christchurch Hospital in a critical condition after emerency services were called to Chapmans Boundary Road in West Eyreton at about 12.15pm.
St John said the injured person had been flown to Christchurch Hospital, after responding with a helicopter, two rapid response vehicles and an ambulance.
The fatality rate in forestry is about 20 times higher than the average across all sectors.
Sign up for Ngā Pitopito Kōrero, a daily newsletter curated by our editors and delivered straight to your inbox every weekday.