Warning as ticket touts arrested.
Five people were held on suspicion of ticket touting just hours before the opening ceremony on Friday.
Of these a 57-year-old German and a 30-year-old Slovakian woman were charged with ticket touting, Scotland Yard said.
Officers made a further 11 arrests on suspicion of ticket touting on Saturday, while two people were held in relation to the alleged theft of two Olympic Lane passes.
The head of the Metropolitan Police's Operation Podium, Detective Superintendent Nick Downing, said: "My team has been working tirelessly to clamp down on ticket touts. We will continue to seek out and take robust action against anybody who tries to cash in on the 2012 Games in this way.
"Ticket touting is illegal and is a clear exploitation of those who genuinely wish to experience the Games first-hand.
"I would also urge people to think twice about purchasing tickets from these criminals: if you do, you are likely to find yourself paying over the odds for them, while at the same time fuelling criminality."
He said anybody buying tickets from unofficial places could end up with their personal and credit card details stolen for use in other crimes.