Fight for life after Northbridge assault A 23-YEAR-old man is fighting for his life in Royal Perth Hospital after being assaulted in Northbridge in the early hours of Saturday morning. The young man was assaulted on William Street just after 4am and sustained serious head injures. The street was closed to traffic for several hours while forensic officers scoured the scene for evidence. A spokesman at Royal Perth Hospital said this afternoon the 23-year-old man was in a critical condition and was receiving treatment in its intensive care unit. Police are expected to release further information about the assault later today as well as CCTV footage of a "person of interest" they wish to speak to. Anyone with information about the assault should call Crime Stoppers on 1800 333 000.