Detectives seized a record haul of more than 50,000 counterfeit designer goods after smashing an international crime syndicate.
Officers were assessing the scale of the conspiracy yesterday after swooping on 30 premises including businesses, storage buildings and homes.
They found clothing, footwear, handbags and hair straighteners during searches across the greater London area yesterday.
The multi-million pound haul included brands such as Nike, Ugg, Gucci, Adidas, Versace, Ralph Lauren and GHD.
A total of £350,000 in cash was also discovered as six people were arrested on suspicion of conspiracy to defraud.
Investigators believe the counterfeit goods were smuggled into Britain and the United States in shipping containers from China and Malaysia.
The move followed a trans-Atlantic investigation involving City of London Police and officials at the United States Immigration and Customs Enforcement.
Nine people in the US face prosecution for smuggling huge quantities of counterfeit goods into the country.
These include 120,000 pairs of Nike shoes, 500,000 Coach handbags, 10,000 pairs of Coach and Gucci shoes and 500 Cartier watches.
City of London Police Commissioner Mike Bowron said it is one of the largest seizures of counterfeit goods ever made. He said: "We have listened to the concerns of the business community which has resulted in a determined international effort to combat an aspect of financial crime which has far reaching implications for UK, the rest of Europe and the US.
"By working in close collaboration with the US Immigration and Customs Enforcement Agency and the UK Border Agency we have made a significant breakthrough in this joint investigation."
John Morton, of Immigration and Customs Enforcement, said the smuggling and trafficking of counterfeit goods is a global problem.
He said: "Only through our combined efforts will we be able to successfully confront this international challenge."
Brodie Clark, of the UK Border Agency, said counterfeit goods deprive the public purse of taxes and rip off the public.
He said: "People who make the mistake of buying cheap copies might think they are getting a bargain, but they don't realise these goods are often dangerous and that the proceeds are often used to fuel serious organised crime."