A teenager who was seriously injured after a framed window popped out of a 27th-floor flat and fell on his head and back is suing the Housing Authority for damages. In a High Court writ filed yesterday, Cheung Chi-hang, who is now 18, claimed he suffered serious personal injury, loss and damage arising out of the negligence of the Housing Authority and Chan Yuk-ching, whose address matches the flat from which the window fell. According to the writ, the accident occurred on May 9, 2001, when a window frame from the flat in Sun Wo House, Tai Wo Estate, Tai Po, fell and struck Mr Cheung. Reports at the time said the teenager was taken unconscious to Prince of Wales Hospital in a serious condition. His family said he had suffered back injuries and a brain haemorrhage. The same window also injured a housewife, who refused medical treatment and left the scene after making a statement to police. There have been widespread concerns about the issue of window safety this year after a series of such accidents. On January 17 a woman, 70, died when she was hit by a falling window in Yau Ma Tei. And on January 21 an 86-year-old man was killed while walking in Kennedy Town in a similar incident. After these deaths, Director of Buildings Marco Wu Moon-hoi said the department was concerned about the incidents and urged property owners to employ qualified maintenance workers. He said he was considering making it obligatory for contractors to provide proof of any window repairs made to the department. A Legislative Council panel meeting also raised the issue of window safety in January when the Deputy Director of Buildings, Cheung Hau-wai, said the spate of accidents was due to defective hinges. He said the government would reinforce safety promotion and offer guidelines to the building industry on window design and installation.