A 60-year-old man has been killed and another has been injured after an incident on the Queensferry Crossing.
It is understood that the man was hit by a moving boom on a Giraffe crane at about 12:20 on the deck of the north tower.
Work has stopped for an investigation into the accident to take place.
The £1.4billion crossing was ordered by ministers because of the corrosion to the main suspension cable on the Forth Road Bridge and is due for completion by the end of the year.
The death is thought to be the first fatality on the site that started work in 2011.
Ucatt Scottish regional secretary, Harry Frew, said his thoughts were with the man’s family.
Mr Frew said: “We were just on our way back from a Worker’s Memorial Day ceremony in Glasgow Green to commemorate workers who have been killed at work when we heard the news.
“I am very saddened about this tragedy and our thoughts are with his family.”
A Forth Replacement Crossing spokesman said: “We are deeply saddened to have to confirm there was an incident just before noon on 28 April on the Queensferry Crossing’s north tower in which a person has lost his life.
“One other person has been taken to hospital. All activity has been stopped at the north tower.
“Our thoughts are with the family and friends of our colleague and co-worker at this time.”
A Police Scotland spokesman said: “We are currently working alongside our partner agencies to investigate an incident on the Queensferry Crossing Bridge that resulted in a man sustaining fatal injuries.
“The call was received around 12.20 on Thursday and sadly, the man was pronounced dead a short time later.
“Another man on the bridge also sustained minor injuries.
“Inquiries to establish the full circumstances surrounding this matter are ongoing.”