Detectives investigating the theft of £1 million from two banks by a suspected international crime ring have arrested four people and seized £80,000 and a live grenade.
Raids were carried out in the Enfield and Islington areas of north London yesterday after bank customers were targeted with fake emails carrying viruses.
The messages, which appeared to be legitimate emails from the banks, carried malware that allowed the gang to take £1 million from the customers' accounts.
Police seized the cash, jewellery and a Range Rover during the raids, and bomb disposal experts were called to deal with the grenade, which was discovered at a property in Bowes Road, Enfield.
Detective Chief Inspector Jason Tunn, from Scotland Yard's cyber crime unit, said: "These arrests follow an investigation into what we suspect is an international and organised crime targeting a number of bank customers in London and across the UK.
"The victims have been hoodwinked by malware-carrying emails purporting to be from their banks, and subsequently had money taken from their accounts."
The men are currently being questioned at a police station in central London, while the women have been released on bail until early next year.