Six yum cha regulars treated for injuries and 90-year-old remains in hospital Six elderly yum cha diners were hurt yesterday when a 20kg slab of reinforced glass fell on them as they entered a Wong Tai Sin restaurant yesterday. They escaped serious injury but a 90-year-old man remained in hospital in a stable condition last night. The glass, measuring 120cm by 90cm, did not shatter. The six had been queuing outside the Joy Luck House Restaurant waiting for it to open. As they entered after a guard rolled up an exterior shutter, the glass fell from the ceiling in the space between the shutter and the glass doors. Chief Inspector Tse Yiu-tak, assistant Wong Tai Sin divisional commander, said: 'Six elderly customers were hit by the falling glass as they were walking into the restaurant, suffering head injuries.' The two men and four women, aged between 65 and 90, were taken to Queen Elizabeth Hospital. Police said two were bleeding from the head and the rest suffered minor scratches. All but the 90-year-old man were discharged. Detectives from Wong Tai Sin police station are investigating the cause of the accident. The ceiling at the restaurant in the Lok Fu shopping centre had been undergoing repairs, said a manager who gave his name only as Tsang. Police have called in inspectors from the Buildings Department to check the ceiling. 'Officers will look into whether there is a human error such as negligence or poor maintenance that could cause the glass to fall down,' Chief Inspector Tse said. David Ng Tak-leung, president of Hong Kong Federation of Restaurants and Related Trades, urged restaurant owners to check regularly to ensure their premises were safe.