A man is fighting for his life after falling from height while working at an address on Cricklewood Broadway.
Police believe the accident was due to a scaffolding collapse and said road closures were in place around the scene of the accident, near The Crown Hotel, where the air ambulance attended along with The London Fire Brigade.
A second man is also said to have fallen and was taken to hospital although his injuries are not life-threatening.
A police spokesman said: "We believe this to be a workplace accident and the Health and Safety Executive will be informed.
"We were called at 11.38hrs on today (Thursday February 16) to Crickewood Broadway to reports of two males injured after falling from a height."
Police at the @MPSBarnet twitter feed tweeted this picture of the scene and said that the incident was a scaffolding collapse.