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Two of four men arrested in a counter-terrorism operation last weekend have now been released without charge, police said.
Scotland Yard said a 28-year-old British national of Azerbaijani origin arrested last Sunday on upmarket Westbourne Grove in west London had been released without charge.
Earlier, a spokesman confirmed a 29-year-old British national of Pakistani origin arrested in Peckham, south-east London, had also been freed.
Two 25-year-olds are still in custody following a swoop where marksmen used special ammunition to stop a car on Mansell Street, near the Tower of London.
Detectives have been given until Sunday to question four suspected Islamist terrorists accused of plotting to launch an attack in Britain.
Counter-terror police made a series of arrests in a dramatic operation across London at the weekend.
Yesterday, officers from Scotland Yard were granted warrants of further detention by Westminster Magistrates' Court and now have until Sunday to question four men.
CCTV footage obtained by ITV News shows police tackling one suspect on upmarket Westbourne Grove in west London.
ITV News understands that the four terror suspects arrested in London yesterday are being held in connection with travel to Syria, although it is not clear how many of those arrested are linked to Syria.
Detectives are questioning a group of suspected Islamist terrorists amid fears the men were plotting to launch an attack in Britain.
ITV News has obtained dramatic CCTV footage of one of a series of arrests across London, in which counter-terror police are seen tackling a 28-year-old suspect on the upmarket Westbourne Grove in west London.
This report is by ITV News UK Editor Lucy Manning:
ITV News has obtained CCTV footage of one of the four anti-terror arrests in London last night.
The video shows the 28-year-old suspect leaving a Persian restaurant in Westbourne Grove before he and another man are wrestled to the ground by a group of officers.
It is not clear whether the minibus which pulls up to the suspect is a police vehicle. Unmarked police cars attend the scene once the men are apprehended.
The British national, believed to be of Azerbaijani origin, was arrested on suspicion of the commission, preparation or instigation of acts of terrorism.
George Paul witnessed the arrest of one of the suspects in Westborne Grove and told ITV News he saw "three policemen holding down one individual - I don't know what ethnic origin he was but he was shouting.
"It was all over in ten minutes."
Ramin Massodi, who witnessed the drama unfold from inside the Persian restaurant where he works, described the suspect arrested in the upmarket Westbourne Grove raid as "handsome", saying: "He definitely didn't look like a terrorist at all."
Mr Massodi said the arrested man had been swooped on by specialist officers in several cars who pushed him up against the glass of the restaurant.
"I heard shouting then I looked outside and saw four cars... and they grabbed him," he said.
Neighbour George Paul, who lived across the street from the restaurant, said he was sitting in his flat when he head the commotion outside."I poked my head out the window - it was dark - but I could clearly see at least three cars," he said.
"They were stopping traffic in all directions. There were two policemen on top of a guy, pinning him down and from what I may have heard, the assailant said in maybe a foreign accent 'please don't break my arm'."
Special ammunition designed to breach doors or burst tyres was fired at a car during a series of anti-terror raids across London.
Armed police fired Hatton rounds - large shotgun ammunition used to stop vehicles - at a car on Mansell Street, close to the Tower of London, last night.
Police are still searching six addresses and two vehicles in London following the arrest of four men in a pre-planned terrorism operation.
Two men aged 25, one man aged 28 and a 29-year-old man all remain in custody.
Latest ITV News reports
Detectives spent the day questioning four suspected Islamist terrorists amid fears the men were plotting to launch an attack in Britain.