Four men have been charged with trying to steal millions of pounds from Santander by hacking into the bank's computer system, Scotland Yard confirmed on Saturday.
Twelve men were arrested on Friday, following an operation by the Metropolitan Police's Central e-Crime Unit, over the alleged plot which centred on a Santander branch in southeast London.
Address in Hounslow, Westminster and Slough were among those searched by police.
The four men were named as 25-year-old Lanre Mullins-Abudu, 34-year-old Dean Outram, 27-year-old Akash Vaghela, and 35-year-old Asad Ali Qureshi.
They will appear at Westminster Magistrates Court today.
Eight others have been released on police bail pending further enquiries, police said.