Emergency services were called to the St Enoch Shopping Centre in Glasgow around 3:20pm today.
A 43-year-old man, who was part of the team working on a £40 million upgrade of the centre, has died in the incident.
The worker was pronounced dead at the scene.
A Police Scotland spokesperson said: “A joint Police Scotland and Health and Safety Executive investigation is ongoing.”
The Scottish Fire and Rescue service said two appliances and a heavy rescue vehicle had been sent.
The centre’s upgrade is expected to be completed next year.