West Yorkshire Police are piloting “Graffiti Alerts” using photo-sharing site Flickr and the site features graffiti photos, as well as locations, of a number of areas in Calderdale and the wider areas of West Yorkshire.

If you recognise any of the graffiti “tags” or images, you can report your suspicions online to Crimestoppers – and you might even qualify for a small reward.

Check out the photos and see if you can help