It is understood the person was injured in an accident involving electric company Marlborough Lines on Alfred St.
A Hato Hone St John spokesperson said they sent one ambulance and a helicopter to the incident.
“One person in a critical condition was transported to Wellington Hospital,” they said.
A nearby office worker, who did not want to be named, said it took a while for emergency services to arrive.
“The scream was horrific, there was lots of blood, it seemed to take ages for the ambulance to come.”
A fire engine and rescue helicopter responded to the scene shortly after.
Police said they had been made aware of the incident but were not required to attend at this stage.
The New Zealand Herald has approached WorkSafe NZ and Marlborough Lines for comment.
