According to the British Sunday Times, the International Olympic Committee (IOC) officially allows a 20% mark up on event tickets. This is to allow event organizers to raise money. Some groups apparently think that is not enough, as the Times reports a huge black market for Olympic tickets. In one instance, a Serbian official offered 1,500 tickets for sale and the promise to falsify passports to go along with them. The IOC is threatening an investigation into the allegations.