A second man has been released from police custody with no further action following the Parsons Green terror attack.
The 48-year-old man was arrested on Wednesday (September 20) at an address in Newport.
A 21-year-old who was arrested in Hounslow at just before midnight on Saturday (September 16) has also been released with no further action.
Four other men remain in custody under section 42 of the Terrorism Act in connection with the investigation.
They include a 25-year-old who was arrested on Tuesday (September 19) and a 30-year-old who was arrested on Wednesday (September 20) at separate addresses in Newport.
Warrants for their further detention until Tuesday (September 26) were granted on Thursday (September 21) by Westminster Magistrates' Court.
Two teenagers also remain in police custody - they are a 17-year-old who was arrested under section 41 of the Terrorism Act after officers searched an address in Thornton Heath in the early hours of Thursday morning (September 21).
An 18-year-old man was arrested on Saturday morning (September 16) by Kent Police at the Port of Dover.
A warrant for his further detention was granted by Westminster Magistrates' Court until Saturday (September 23).
A search which was carried out at an address in Surrey is complete according to the police, but another Surrey address is still being searched alongside an address in Thornton Heath and two in Newport.
"This continues to be a fast-moving investigation," said the Head of the Met Counter Terrorism Command, commander Dean Haydon.
Adding: "A significant amount of activity has taken place since the attack on Friday.
"We have four males in custody and searches are continuing at four addresses.
"Detectives are carrying out extensive inquiries to determine the full facts behind the attack.
"We anticipate that the searches will take some days to complete and may cause further disruption.
"However, it is important that we continue with these searches and I'd like to thank all those affected for their support, patience and cooperation."
He added: "As police and our partners do all we can to confront the threat, public vigilance remains as vital as ever.
"We urge the public to report any suspicious activity to the police by calling us, in confidence, on 0800 789 321, or in an emergency by dialling 999.
"We are asking the public to look out for anything that seems out of place, unusual or just doesn't seem to fit in with day-to-day life. It may be nothing, but if you see or hear anything that could be terrorist-related, trust your instincts, then act, and call us."
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