At least eight people have been arrested in connection with a 1.3 million pounds (over $2 million) e-theft by a gang who took control of a Barclays Bank computer, BBC reported Friday.
According to a Met Police spokesperson, the money was transferred from the branch in Swiss Cottage in north London in April.
The men, aged between 24 and 47, were held Thursday and Friday.
Searches are being carried out at addresses across London where property including cash, jewellery, drugs and credit cards has been seized.
The raid is being linked to an attempt to steal from Santander, one of the world's largest banks, last week.
Det Supt Terry Wilson said the latest arrests "are a different level, it's really the top tier of this criminal network that have been arrested".