More than £25m in cash has been stolen from a depot in Kent after its security manager and his family were kidnapped by armed robbers posing as police.
The raid was carried out in the early hours of Wednesday at Securitas, in Vale Road, Tonbridge, by at least six men who tied up 15 staff members.
The manager was abducted after being pulled over in his car by what he thought was an unmarked police vehicle.
The Bank of England confirmed the scale of the robbery on Wednesday evening.
A Securitas spokesman said "a substantial amount of money running into millions of pounds" had been taken.
He said the exact figure would only be known once a complete audit of the site had been carried out.
The kidnapping of the manager took place at about 1830 GMT on Tuesday.
He was in his silver Nissan Almera on the northbound carriageway of the A249, just past the Three Squirrels public house near Stockbury, when he was pulled over by what he believed was a police vehicle.
He was spoken to by a passenger wearing a high visibility jacket and a police-style hat.
Thinking they were genuine police officers, he got into the kidnappers' vehicle where he was handcuffed.
At the same time, the man's wife and young son were taken from their home in Herne Bay after two men claiming to be police officers said he had been involved in an accident.
The depot manager was transferred to a white van, tied up at gunpoint, and then driven to another location where he was told to co-operate or his family would be in danger.
At about 0100 GMT on Wednesday, he was taken by car to the Securitas depot and the raid was carried out.
The balaclava-clad robbers, some of whom had handguns, left at about 0215 GMT.
The staff who had been tied up managed to raise the alarm about an hour later.
They were all shocked but unhurt.
Det Supt Paul Gladstone said: "This was a traumatic ordeal for the manager and his family and for all of the staff.
"This was clearly a robbery that was planned in detail over time.
"A very substantial sum of money running into millions of pounds has been stolen and we are determined to bring the robbers to justice."
Police are appealing for information from anyone who may have seen the manager's silver Nissan, or a Volvo or similar vehicle meeting up with a white van.
They also want to trace a 7.5 tonne truck which was used in the robbery itself.
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