Police have thwarted what they believe would have been Britain's biggest robbery.
The target was £40m pounds worth of gold bullion and between £30-40m in cash, stored at the Swissport Cargo Warehouse at Heathrow Airport.
Armed police were lying in wait for the gang as a white Transit van smashed into warehouse doors.
Seven people have been arrested - one man who hijacked a vehicle is still on the run.
The gang threatened staff with at least one firearm, knives, cudgels, hockey sticks and lumps of wood, after reversing at speed through the warehouse shutters at 1000 BST on Monday, police said.
They then forced their way into a secure area containing a large quantity of precious metal and bank notes.
"
We have foiled what would have been one of the biggest robberies ever committed in the UK
"
Det Supt Barry Phillips
But as the men tried to escape, officers fired special bullets - designed to deflate tyres with minimal damage - into the van's wheels.
Six men were arrested but two suspects hijacked a white van, forcing the driver to smash through entrance gates and drive to Stanwell, Surrey, police say.
The driver of the hijacked van gave himself up near the airport shortly before 1300 BST.
But the other man escaped on foot.
The hijacked van was recovered, and those arrested taken to West London police stations for questioning, the Metropolitan Police said in a statement.
One officer had suffered minor injuries, the statement added.
A Swissport spokesman said security guards had stopped the van at the complex's main entrance - but the gang had had legitimate paperwork to collect a shipment.
The gold bullion and cash had arrived earlier on Monday, he added.
"Some members of higher management were aware this raid was going to take place - but for operational reasons this information was not shared with the rest of the workforce," the spokesman added.
"This has obviously been a very shocking experience for many of our members of staff - some are very upset, and counselling has been arranged for them.
"The company was pleased to co-operate with the police, and congratulate them on the outcome."
FOILED HEIST AT HEATHROW
1 1000 BST: Armed gang ram warehouse shutters in a van and threaten staff. They are trying to steal £40m in gold bullion plus cash.
2 Police lying in wait disable the van and arrest six of the gang
3 Two men hijack another van and drive off towards Stanwell
4 1300 BST: Seventh man is arrested
The gang is thought to have had inside information about the warehouse.
Detective Superintendent Barry Phillips, of the Flying Squad, said: "They knew where the gold bullion was located inside the premises and went straight for it."
But the area had been under surveillance for weeks.
Swissport's management had been "very co-operative", Det Supt Phillips added.
"In preventing this attack, we have foiled what would have been one of the biggest robberies ever committed in the UK. We believe that these men were part of an organised criminal enterprise," he said.
"A lot of planning and preparation went into the attack - but the Flying Squad was one step ahead of the team for some time."
The swoop operation, codenamed Cartwright, was part of the larger Operation Grafton, an initiative launched by the Met's Specialist Crime Directorate in partnership with Thames Valley Police, Surrey Police, HM Customs and Excise.
Det Supt Phillips said the initiative had enjoyed "substantial success in dismantling the organised networks that have been operating in and around the airport" in the past year.
World's biggest robberies
It was "a classic example of that partnership approach" and had "removed a serious and organised criminal gang", he added.
The gang were "career criminals", with some known to police, Det Supt Phillips said.
The Met's Specialist Crime Directorate head Assistant Commissioner Tarique Ghaffur said: "A professional team of armed robbers have now been removed from society."
Airport operator BAA Heathrow said in a statement: "We are delighted.
"We have worked very closely with the police and cargo operators at Heathrow in recent months on improving security around valuable cargo."
Swissport, majority-owned by London-based private equity house Candover Partners Ltd, handles more than three million tonnes of cargo every year.
Its UK customers include British Airways, First Choice, Ryanair, Monarch, Britannia, Thomas Cook Airlines, easyJet, FlyBe, Eastern Airways and Virgin Atlantic.
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