Police officers stormed a number of addresses at dawn
Fourteen people have been arrested under the Terrorism Act in raids on addresses in London, Cambridge and the West Midlands.
Four men were taken to a central London police station by Metropolitan Police Anti-Terrorist Branch officers.
Four men and two women were arrested at addresses in Cambridge and detained under Section 41 of the Act.
Four men were held in raids in Walsall and Dudley, though police said these arrests were not linked to the others.
Section 41 governs offences relating to involvement in the commission, preparation or instigation of acts of terrorism.
"Officers from the Metropolitan Police Services' anti-terrorism branch executed search warrants at six residential and three business premises in southwest London," a spokeswoman said.
It is part of this massive effort we have been having since 11 September. And it will continue
Sir John Stevens
UK 'must remain' on terror watch
Britain's most senior police officer, Sir John Stevens, told BBC News four UK residents had been arrested at 0530 GMT as part of an "ongoing operation".
"We are arresting people continuously," he added.
"It is part of this massive effort we have been having since 11 September. And it will continue."
Permanently vigilant
The latest operations come as Prime Minister Tony Blair warned that the UK must remain "permanently vigilant" against the threat of terrorism.
Britain has been on the second highest security alert for two weeks since officials warned they had intelligence suggesting an attack was planned.
They have not specified any particular target.
On Monday, police were granted 48 more hours to hold a suspect anti-terror officers arrested in Gloucester last Thursday.
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