An operation across London and Kent, south-east England, was not linked with the arrest of a 27-year-old man with knives near the Houses of Parliament yesterday, the Scotland Yard said today.
Metropolitan Police Deputy Assistant Commissioner Neil Basu told reporters outside New Scotland Yard in London today that highly trained firearms officers carried out a "specialist entry into an address" in north London that they had under observation as part of a current counter terrorism investigation.
A 16-year-old boy, a man and woman, both aged 20, were arrested during the operation in Willesden area of north London.
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Two further arrests were also made in Willesden after a man and woman returned to the property.
"In total six people have now been arrested in connection with that investigation - four at or near the address and one in Kent. The two further arrests were made when a man and a woman - both aged 28 - returned to the address later last night," Basu added.
"Searches are ongoing at three London addresses as part of this investigation. Due to these arrests that we have made, I believe that we have contained the threats that they posed."
All suspects have been arrested on suspicion of the commission, preparation and instigation of terrorist acts under Section 41 of the UK Terrorism Act 2000 and remain in custody at a south London Police station.
The address and persons connected with it had been under observation by counter terrorism officers as part of an ongoing intelligence-led operation, according the police.
In line with established post incident procedures, the incident has been referred to the Met's Directorate of Professional Standards.
Yesterday, armed officers were seen arresting a man near Parliament Square. Knives were seen lying nearby.
The 27-year-old has been detained on terrorism charges and is believed to have a British passport but was born outside the UK.
He remains in custody having been arrested for Terrorism Act Offences and also possession of offensive weapons and there are two ongoing searches at addresses in London as part of that investigation.
Basu also sought to reassure the public in reference to the terror attack on Parliament on March 22, which claimed four innocent victims.
"I wanted to reassure the public that our increased activity to combat terrorism over the last two years continues - both by police and security services. Activity continues around the clock to identify and stop these threats and we are making arrests on a near daily basis."
"We will continue to work with all communities to defeat terrorists together - we will not allow common criminals to spread discord and fear.