Counter-terrorism officers have arrested five men in raids across the UK after foiling a suspected terror plot.
The men were arrested on Monday at addresses in north London, Manchester and Peterborough.
The Metropolitan Police's Counter Terrorism Command unit joined forces with the Counter Terrorism Policing North West (CTPNW) unit and the Eastern Region Special Operations Unit (ERSOU) CTP in the raids.
All five men have been arrested on suspicion of terrorism offences.
Scotland Yard says the arrests were part of a pre-planned operation and there is not believed to be any imminent threat to the public.
The arrests are not linked to the attack at Fishmongers' Hall by London Bridge on 29 November nor the forthcoming New Year's Eve celebrations, the force said.
A 21-year-old man arrested in Manchester, a 19-year-old from Peterborough and two men, aged 23 and 22, from north London have all been arrested on suspicion of the commission, preparation or instigation of an act of terrorism.
A fifth man, aged 19, from Peterborough, has been arrested on suspicion of encouraging terrorism.
Officers are currently carrying out a number of searches at addresses in Manchester, Peterborough and north London.
All five men remain in police custody at this time.
Convicted terrorist Usman Khan was shot dead by officers last month after going on a stabbing spree, fatally wounding two Cambridge university graduates and injuring several others, near London Bridge.
Khan was jailed in 2012 over a plot to bomb the UK’s stock exchange but was released in December 2018.
He joined a desistence and disengagement programme, a new strand of the government’s counterterrorism programme, designed to help deradicalise convicted extremists.
The authorities have faced criticism for ignoring warnings about him.
Security in London has been stepped up ahead of its New Year's Eve celebrations.
Gold Commander for the night, Commander Paul Brogden, said: "We want everyone who comes to London for New Year’s Eve to have a good time.
"Their safety and security is our top priority and officers have been planning for the event for several months. Officers will be out and about to deter criminals and keep crowds safe but we need you to look after yourself and those around you as well.
"If you see anything suspicious or that causes you concern, please tell a steward or police officer. Keep an eye on your belongings and only bring what you need."
