Graffiti was found in area accessible only to officers and staff at Charing Cross police station in late August
The Metropolitan police have launched a criminal investigation into one of their own police stations after racist graffiti was found daubed on a wall to which only officers and staff have access.
Graffiti containing the N-word is alleged to have been found written on a toilet wall at Charing Cross police station in central London. It was spotted and reported by an officer on 29 August, just after Notting Hill carnival.