About 6,500 counterfeit items of clothing, including T-shirts supposedly bearing the Olympic logo, have been seized from a shop in central London.
There were so many goods at the store in the east end of Oxford Street that they were clogging up stairwells and fire escapes, Westminster Council said.
Products by leading manufacturers had been faked and an unofficial Olympic motif was used on some, it added.
The Metropolitan Police has begun an investigation following the raid.
The items had a resale value of £100,000.
They were discovered following a tip-off that counterfeit goods were thought to have arrived in the UK through the docks at Southampton.
"This was a particularly large seizure by my team," said Sue Jones, the head of Trading Standards in Westminster.
"We have noticed an increase in counterfeit goods recently, particularly sportswear, and will continue to take action to combat this illegal activity," she added.
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