Police want to speak to two men whose charity fundraising efforts in the Onchan area have drawn complaints from members of the public.
Officers say anybody approached by collectors should make sure they have a valid licence and appropriate identification.
If you can help the investigation you are asked to ring the Eastern Neighbourhood Policing Team on 675190, or speak to any officer.
TT organisers announce revised Saturday race schedule
Senior race to be restarted over four-lap distance tomorrow (6 June)
TT campers in 'high spirits' despite rain affecting race week
'Costa del Ballaugh' one week, mud the next
Rider taken to Noble's Hospital after Senior TT red flag
Competitor 'conscious and talking' after incident at 11th Milestone
Red flag stops Senior TT race
Race halted during second lap
Further delay to TT schedule due to 'non-racing operational matter'
Clerk of the Course confirms change to proceedings