A Mercedes-Benz belonging to Jerry Sung Yee-ven, son of the Hong Kong Flour Mills founder, was vandalised and set on fire outside his home yesterday and a warning daubed on a wall beside it. Police were called to the two-storey house in Kadoorie Avenue, Ho Man Tin, at about 10am when Mr Sung's 49-year-old chauffeur arrived for work and found the dark blue vehicle, parked outside a garage, wrecked. Mr Sung, youngest son of the late David Sung Ling-fang, and his family were out of town. A watchman had guarded the house overnight. A police spokesman said the car's right rear door window had been broken open and the interior burned and blackened. 'A burned plastic bottle containing inflammable liquid was found on the rear passenger seat,' the spokesman said. 'Words like 'beware', written in Chinese characters, were daubed in black paint on the wall next to the vehicle.' Staff at the house told police Mr Sung visited Hong Kong once or twice a year. They said they did not know why the vehicle had been set alight. Mr Sung is the former managing director of Hong Kong Flour Mills which was sold to Lam Soon (Hong Kong) in 1989. He is understood to be keenly interested in horse racing in Hong Kong and Asia. His father, who established the company in 1954 and died in 1970, was decorated by the Sultan of Perak for his contributions to industrialisation in the Malaysian state and his philanthropic activities. Kowloon City detectives are investigating the attack. In March, two cars belonging to National People's Congress deputy Tsang Hin-chi were destroyed in arson attacks at his Kowloon City house. Mr Tsang, the chairman of fashion retailer Goldlion Holdings, his son Tsang Chi-ming, four domestic staff and two nurses had to be evacuated from the Chester Road home after a Mercedes and another family car were set alight.