U.K. Police Hunt Graffiti Vandal Who Caused £1M Damage Across London

Police investigating a prolific graffiti vandal thought to have caused £1 million ($1.6M) of damage across London appealed to members of the public for help Tuesday.

The artist has spray-painted the tag "ZERX" extensively across schools, homes and historical buildings in the Harrow, Brent and Westminster areas, and along the London Underground transport system, police said.

The daubing also appeared on the side of a government building following student protests last December.

Police already arrested a 21-year-old man in January in connection with the investigation but released him on bail to appear before police again in October.

They are now urging anyone who may have information on the graffiti attacks to come forward.

"Using this type of graffiti not only looks very unsightly but can also cost councils, London Underground and members of the public a considerable amount of money to remove," Detective Inspector Paul Armstrong from the Metropolitan Police said.

"This tag has been scrawled across residential homes as well as schools, sheltered accommodation and historical structures and I would appeal to anyone who has information about the person who is responsible for this to contact police," he added.