A 50-YEAR-OLD police officer was in hospital last night after trying to kill himself in a women's toilet in Aberdeen police station. The senior constable, identified as Tsui, shot himself in the stomach with his own revolver. He is in fair condition. A construction worker renovating several rooms in the building - including the toilet - heard two shots at 1.40 pm. He found Constable Tsui in a pool of blood on the floor of the room. Other officers burst in and tried to help their friend, Aberdeen Assistant Divisional Commander (crime), Gordon Wan Yiu-kei, said. He said Constable Tsui had been on a lunch break and had been on duty in the morning. He said Constable Tsui had been transferred to Aberdeen division from the Western district in June, and had been a uniformed officer in the force for more than 18 years. Constable Tsui was taken to Queen Mary Hospital where he underwent about four hours of emergency surgery to remove one bullet from his abdomen. Mr Wan said it appeared the second bullet hit either the floor or a wall. ''Because the room is being renovated it is very difficult to tell where the other bullet went,'' he said. ''There are holes all over the wall and floors as it is.'' In the hospital's intensive care unit, Constable Tsui's sobbing wife was being comforted by friends and fellow police officers. ''It's very upsetting,'' said one officer, who refused to give his name but said he was an old friend.