A seventh suspect in the Parsons Green terror attack has been arrested, police said on Monday. He was taken to a south London police station where he remains in custody, the Metropolitan police confirmed in a statement.
Police have since made arrests in Dover, London and Newport, south Wales.
The unnamed individual was arrested by officers at 6 a.m.in Cardiff under section 41 of the Terrorism Act.
The blast of a home-made bomb, which apparently failed to detonate fully, on the west London tube was the fifth major terrorism attack in Britain this year.
A 20-year-old man is being held in custody at a south London police station after being arrested by counter-terror officers in Cardiff at about 6am on Monday.
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Ahmed Hassan, an 18-year-old from Sunbury, Surrey who had previously been identified as "A", was charged with attempted murder and causing an explosion likely to endanger life or to cause serious injury to property.
The blast from the improvised explosive device caused burns for some passengers while others were injured in the blast's stampede.
Two other men are still being questioned by police while three others have since been released by detectives and face no further action.
Prosecutors said Mr Hassan had meant to kill innocent people because of his "warped political view".