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Police seized computers and luxury goods from two addresses in north London on Tuesday morning as part of their investigation into an apparent online scam.
Officers executed search warrants at a residential address in Stadium Mews, Islington and another in Bowes Road, Enfield.
They recovered a number of computers, smart phones and other media devices, to be forensically examined, as well as luxury goods such as designer jewellery and a Range Rover.
A police call-handler passed information to her boyfriend during the manhunt for his friend Dale Cregan, a court has heard.
Kathryn Smith, 25, is accused of using police's computer systems while on her shift to check developments to find Cregan, who was wanted in connection with the murders of a father and son.
It is alleged she then passed on information to her boyfriend Sean Booth, 31, who lived on the same street as Cregan, which was subsequently passed onto Cregan's 56-year-old mother Anita.
All three deny a single count of misconduct in a public office: Ms Smith by looking for and disclosing confidential information and Mr Booth and Mrs Cregan by aiding and abetting her to commit the offence.
Today's arrests follow an investigation into an apparent online scam whereby £1 million was siphoned off the accounts of customers of two banks.
The alleged scam involved emails, that appeared to be from the banks, containing "malware" which corrupted the recipients' computers.
T/DCI Jason Tunn of the Metropolitan Police's Cyber Crime Unit said he suspects they are dealing with 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," he said.
Four people have been arrested on suspicion of conspiracy to defraud, conspiracy to launder money and possession of an explosive.
The two men and two women were detained as part of an investigation led by the Metropolitan Police's new Cyber Crime Unit.
The men are currently in custody at a central-London police station and the women have been bailed to return on a date early next year.
Hundreds of police officers attended the funeral of Constable Kirsty Nelis, who was on board the police helicopter which plunged through the roof of the Clutha pub in Glasgow, killing nine people.
Uniformed police officers saluted as her coffin entered St Andrew's Cathedral in Glasgow, where up to 1,000 mourners turned out to pay their respects.
Her parents and husband Mark, also a serving officer, led mourners, including Scotland's First Minister Alex Salmond.
A private service followed at Clydebank Crematorium.
After a cold, frosty and in places, foggy start, this afternoon is looking a lot clearer.
Bright skies with low and at times, dazzling and low winter sunshine, might mean you need your sunglasses - especially when driving!
In parts of Norfolk, Cambridgeshire and Lincolnshire - especially around The Fens - it is set to stay disappointingly grey and misty.
With more cloud in Northern Ireland and Scotland, temperatures will feel mild for this time of year. Elsewhere, expect it to be chilly - with the lowest temperatures in the south-east of England.
Four people have been arrested and £80,000 seized by detectives investigating the suspected theft of £1 million from two UK banks, Scotland Yard said.
A suspected live hand grenade was also removed from an address by specialist explosive officers, following raids in Enfield and Islington yesterday morning.
A world record has been broken in Birmingham this lunchtime for the longest Christmas cracker pulling chain.
749 people were involved in the biggest simultaneous cracker pull, which took place in Brindley Place.