A third man has been arrested in connection with the Parsons Green terror attack, Scotland Yard said.
The 25-year-old was held in a counter-terrorism raid in Newport, south Wales, shortly after 7pm today.
A Metropolitan Police spokesman said a building in the town was being searched.
Two other men aged 18 and 21 remain in custody in connection with Friday’s bomb attack on a London Underground train in south-west London.
The raid was carried out by the Metropolitan Police Counter Terrorism Command, assisted by Gwent Police and the Welsh Extremism and Counter Terrorism Unit (WECTU).
An address in the town was being searched on Tuesday night.
Commander Dean Haydon is head of the Counter Terrorism Command.
He said: “This continues to be a fast-moving investigation. A significant amount of activity has taken place since the attack on Friday.
“We now have three men 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.
He added: “However it is important that we continue with these searches and I’d like to thank all those affected for their support, patience and co-operation.”
Yahyah Farroukh, 21, and an 18-year-old man remain in custody after detectives were granted more time to question them over Friday morning’s bomb attack on a London Underground train.
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