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Hundreds of people have been turned away from a 2012 ticket collection point because of admin problems.
The biggest overseas agency for London 2012 tickets was at the centre of chaotic scenes today as fans waited in the hot sun for up to six hours.
CoSport, the official ticket agency for the USA, Canada, Australia, Norway and Sweden, also faced criticism for giving batches of tickets to families for the same event - but with family members each seated many rows apart.
Spectators were told to pick up tickets from a centre near Paddington in west London but hundreds were forced to queue for several hours.
A London 2012 spokeswoman said:
"They have had issues with the distribution of tickets, something has gone wrong with how they are allocated and distributed.
"We are aware of the problems and anyone who has been affected is advised to contact the CoSport call centre which has been set up in London."