Police have thwarted an "audacious" cyber gang from stealing millions of pounds after they remotely took control of a bank branch's computers.
The men allegedly fitted a computer within a Santander Bank branch with a "keyboard video mouse" device which allowed them to transmit its desktop contents.
Using the gadget, the men remotely took control of all the computers at the branch in Surrey Quays shopping centre in south east London, but it is unclear whether they were able to take any money.
Officers arrested 11 men aged between 23 and 50 in Hounslow, west London on Thursday. A 34-year-old was arrested in Victoria, west London.
Searches were carried out at addresses in Westminster, Hounslow, Hillingdon, Brent and Richmond, and also in Slough, where property has been seized.
A police spokeswoman said: "It is still not clear whether any money was extracted from the computers but we should have more information as the investigation develops."
The men are being held in custody at a London police station.