Police have arrested a man after a security guard was attacked with a knife at the Cable TV building in Tsuen Wan. The suspect was detained following a stand-off with police. Footage on Cable TV showed the man holding a knife against his own chest as several police officers stood by with shields. Police said the incident began shortly before noon when a man attacked a security staff with a knife before running into the building. The victim suffered cut wounds to his arms and head and was sent to the Princess Margaret Hospital for treatment. Police searched the building and found the 19-year-old suspect on a staircase landing. They arrested him following a one-hour stand-off. --RTHK