Olympic village officials are investigating how a bucket of unauthorized condoms found its way into the village without consent.

The Guardian reported that the Australian BMX cyclist Caroline Buchanan tweeted photos of the bucket featuring a sign reading “Kangaroos condoms, for the gland downunder”, and a picture of a boxing kangaroo.

Buchanan joked that the bucket of condoms was in keeping with rumors that Olympians were indulging in a different sort of physical, hands-on activity. She tweeted “Haha, the rumours are true. Olympic village.”

However, the bucket of condoms raised a red flag as they weren’t the official brand provided for free to athletes. Barcelona first started the trend of providing free condoms when Spain hosted the Games in 1992.

Approved by the International Olympic Committee, it has become standard to have free condoms available for Olympians.

The London Olympic organisers provided 150,000 free condoms in dispensers for the 10,800 athletes at the Games, supplied by Durex which paid for the supply rights, the Guardian reported.

A Locog spokeswoman said the brand of condoms in the bucket were from Durex rivals, Ansell Ltd, an Australian company and Pansante, a private British firm. She said the athletes have been told not to hand any of the condoms out as Durex is the sole condom supplier for the village.

There are very strict rules for what can be brought in or promoted in the village; even athletes are not allowed to bring products into the village for their personal use. This is all in a bid to stop non-sponsoring brands from getting any publicity on the back of the Olympics.

Spokeswoman for Durex rival, Ansell, said her company had no hand in the prank and denied any association with the Olympics.

Speaking for Pasante, managing director Lawrence Boon, also denied any involvement with the distribution of condoms in the athletes’ village.

“We have no association with the Olympics but we did launch a gold condom this year for champions,” said Boon. “With such high teenage pregnancy and STD rates, we try to make people carry condoms by making them fun and interesting.”