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Hundreds of police officers flooded Windsor today in a major security operation surrounding the second Royal wedding in the town in six months.
Armed officers were deployed as a precaution while plain clothes spotters mingled with crowds to watch for troublemakers.
Police employed similar measures to the operation to guard Prince Harry and Meghan Markle's wedding in Windsor in May, though with fewer numbers.
Tactics included anti-terror barriers to guard against a terrorist vehicle attack to airport-style screening checks for knives or other weapons.
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Police say there was no intelligence of any threat but measures were in place to guard against a series of possible threats as a precaution.
Thames Valley police has spent weeks preparing for Princess Eugenie and Jack Brooksbank's wedding at an estimated cost of £2 million.
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CCTV and number plate recognition cameras have been deployed to check vehicles coming in and out of Windsor while specialist search teams have been used in recent days.
Much of the security will focus on the couple's decision to go on a short carriage procession through the streets of Windsor following the ceremony.
Princess Eugenie and Jack Brooksbank Wedding - In Pictures
Assistant Chief Constable David Hardcastle said: "The public will see visible security measures to keep everyone visiting Windsor safe and I hope the public are reassured and not alarmed by these.
"There will also be search activity using specially trained search dogs in the town centre, high visibility spontaneous patrols, including a presence from the Mounted Section.
"As you would expect there are also a number of non-visible security measures will also be in place."
The event is not expected to attract the crowds witnessed at the wedding of Prince Harry and Meghan Markle. However, most senior royals will be attending the event as well as a host of celebrities increasing security concerns.
The event has prompted controversy with some MPs and Republic, a campaigning group working for an elected head of state, with criticism of the costs to the taxpayer.
Security inside the castle was being handled by diplomatic protection officers from the Met and the force refused to comment on security or the costs of the operation.
Matthew Barber, Deputy Police and Crime Commissioner for the Thames Valley force, said that once the final costs were known a special grant request would be made to the Home Office to cover the security bill. © Provided by Independent Digital News & Media Limited