The big picture: Patrick Clark, 20, from Fuchsia Lane in Ipswich, has connections across Suffolk, Essex and Hertfordshire. Police say he has specific links to St Albans and Redbourn in Hertfordshire, as well as the Elsenham area of Essex.
What to do:
For immediate sightings, call 999
Report non-urgent information online via the Hertfordshire Police website
Call the non-emergency number 101
Contact Crimestoppers anonymously on 0800 555 111
Bottom line: Members of the public who spot Clark or have information about his whereabouts are urged to contact the authorities immediately, with options to report information anonymously if preferred.
