A 78-year-old man collapsed and died after being told his youngest son had been badly injured in an industrial accident yesterday. The son was already dead at the time. Tang Siu-tong, 34, was crushed when a large concrete slab fell on him as it was being loaded onto a truck at a construction site in Tung Chau Street, Cheung Sha Wan, shortly after 11am. Tang's workmates removed the slab before police and fire officers arrived and he was taken to Princess Margaret Hospital, where doctors declared him dead at 11.35am. A phone call was made to Tang's home at about 11.40am and was answered by his father, Tang Kei, a retired construction worker, who collapsed when told his son had been injured. His wife ran out of the flat and sought help from a neighbour who helped her call police. The senior Tang was taken unconscious to Queen Elizabeth Hospital, where he was declared dead at 12.17pm. 'Initial investigations showed the slab fell when it was not lifted high enough and hit the top edge of the tray of the truck,' a police officer said. 'The huge concrete slab fell on the worker, who was walking past. He was badly crushed and trapped underneath.' Tang Siu-tong had been a construction site worker for more than 10 years, according to one of his relatives. It was his second last day of working at that site. Tang, the family breadwinner, earned HK$800 a day and lived with his parents, wife and two daughters aged eight and nine in an Oi Man Estate flat in Ho Man Tin. A senior police officer from Cheung Sha Wan police station said police had not made the phone call to the Tang home. The call was probably made by one of the son's colleagues, the officer said. 'Police make a caring and soft approach to families over the death of their family members,' he said.