British police are investigating about 30 unauthorised websites illegally selling tickets for the London Olympics, warning fans they risk being "ripped off" if they try to use them.
Ticketing has been the Games' most contentious issue with demand for many events outstripping supply, prompting complaints about the way tickets were allocated, the cost and technical glitches in handling applications.
Sales for the latest batch of Olympic tickets have been unusually sluggish, prompting talk of "ticket fatigue" among cash-strapped Britons.
