Five men and a woman have been arrested in London on suspicion of the commission, preparation or instigation of acts of terrorism, Scotland Yard said today.
The operation is understood to relate to a possible plot involving Islamist extremists with potential targets in the UK.
A 24-year-old man was tasered during his arrest but did not require hospital treatment, police said.
The arrests, which police said are not connected to the London 2012 Olympic Games, were made early this morning by officers from the MPS Counter Terrorism Command.
The threat was not thought to be imminent.
Some of those arrested are understood to be British nationals.
They were part a pre-planned intelligence-led operation involving firearms officers.
The men and woman were all arrested on suspicion of the commission, preparation or instigation of acts of terrorism under the Terrorism Act 2000.
They have been taken to a south east London police station where they remain in custody.
One man, aged 29, was arrested in the street in west London. Another man, aged 21, and the woman aged 30, were arrested at separate homes in west London.
The three other men, aged 26, 18 and 24, were arrested at a residential premises in east London.
Searches under the Terrorism Act 2000 are being carried out at eight homes in east, west and north London and one business premises in east London.
A spokesman for the Metropolitan Police said: “Public safety remains our overriding concern. Today’s operation in London is not linked to the Olympic and Paralympic games.”
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