Police have seized 1,000 stainless steel beer kegs, with a scrap metal value of more than £100,000, believed to have been stolen by thieves targeting the brewing industry, Scotland Yard said.
The stolen kegs were found stored in shipping containers during a police raid at two addresses in Tottenham and Edmonton in north London on Friday afternoon.
A man, aged 19, and a woman, aged 18, were arrested at one of the sites on suspicion of handling stolen goods and are both currently in custody at a north London police station.
Officers from Haringey launched the operation alongside Kegwatch - a company which works on behalf of the brewery industry to try and stop the theft of kegs, casks and gas cylinders - after receiving intelligence, the Met said.
Each metal beer barrel is worth between approximately £75 and £165, according to the force.
Detective Inspector Steven Dryden of Haringey CID said: "In the last 10 years, the price of metal has soared 400% - it's a valuable commodity that makes it an attractive prospect to thieves.
"Thieves and unscrupulous dealers will find industries are not prepared to suffer any further, and police in Haringey will not hesitate to take action against anyone who is found to be involved in this form of criminality in the borough."
Security Director of Kegwatch, David Belcher, said: "Stainless steel beer kegs are used in pubs and clubs across the country. Stolen kegs are often disposed of illegally through illicit outlets and scrap yards. We work hard with police forces up and down the country to stop this from happening and as a result we have had many successful prosecutions."