''When the amah went to my room and saw my wife and brother-in-law and me struggling with the man, she called the police.'' The staff overpowered the robber and tied him up with a rope. Mr Siao gets up at around 5.30 am and cleans Mr Li's car before he goes to golf every morning. ''The security arrangements at the house were very good and this was the first time there had ever been a robbery,'' Mr Siao said. ''I had no idea how the robber could sneak into the house. There were about eight to 10 closed-circuit TVs at almost every corner of the house and five guard dogs in the garden at night,'' he said. Aberdeen Division police questioned the intruder yesterday but refused to release details of his motives or how he gained entry to Mr Li's home. There were signs near the main gate that an electronic sensor or closed-circuit camera had been smashed and repair work was being carried out on electric cables. A metal box marked ''Police'' near the entrance contained a check-in book detailing visits by police patrols over the last month. The last recorded check of the home was made at 2.55 am - about the same time the man was breaking in. The book recorded that checks of the house were made by police two or three times a day. A sergeant signed the book early yesterday. A staff member at the house said the ordeal had been frightening but nothing was stolen. Mr Li, apparently very grateful to the staff for their handling of the affair, said he had always treated his staff well but promised them ''a very merry Christmas'' this year. He went to work as police continued their investigation. His mansion is set into the hillside overlooking Deep Water Bay and the golf course below. To outward appearances, Mr Li's house is a fortress bordered by high concrete walls, a sheer cliff and multiple layers of barbed wire. The walls are lined with floodlights and sensors. Closed-circuit cameras and an intercom system are used to screen visitors at the electrically operated front gate. A police spokesman said the daily patrols made of Mr Li's house were part of a programme to cover ''strategic positions'', but would not say why Mr Li's driveway was considered a strategic position. He also refused to comment on how many other such police check-in boxes were in the territory, or whose homes they were located near, ''for operational reasons''.