Ten men have been arrested after more than £10 million of drugs were seized at an industrial unit in north London.
Detectives spent months investigating the gang made up of six Turkish suspects, three Britons and one Italian national.
Officers raided the warehouse in Enfield and discovered 109kg of cocaine and 15kg of heroin with a street value of £10,220,000 on Tuesday.
The suspects aged in their 20s, 30s and 40s are currently being questioned in police custody.
The National Crime Agency and Metropolitan Police had launched a joint probe.
Detective Chief Inspector Mark Brookes, of the Organised Crime Partnership, said: “This operation is another great example of partnership working between the Met and NCA, which has resulted in a significant seizure of cocaine and heroin.
“This seizure has stopped dangerous drugs from reaching the streets of London and beyond, where they have the potential to cause great harm to people and communities.
“While these operations are complex and resource intensive, they are vital to disrupt organised criminal networks and to ensure we keep our communities safe.
“We know there is an inextricable link between drugs, violence and organised crime – that is why tackling the importation and supply of drugs is a crucial part of our work to reduce violent crime in London.”
The NCA said its investigation continues.