Two workers fell out of a boom platform while carrying out exterior-wall repairs at the Aberdeen Fisheries and Marine Offices on Shek Pai Wan Road. Their safety belts left them suspended in midair, but they were injured after hitting the boom.
The 62-year-old man was reported to be semi-conscious, while the 57-year-old woman was conscious. Both were taken to Queen Mary Hospital.
Police were investigating the incident.