Parsons Green attack: Man describes Cardiff arrest
A seventh person has been arrested in connection with the Parsons Green Tube bomb attack on 15 September.
The 20-year-old man was arrested in Cardiff at 06:00 BST under section 41 of the Terrorism Act and is now being held at a south London police station.
Last week Ahmed Hassan, 18, of Sunbury, Surrey, was remanded in custody charged with attempted murder.
A device partially exploded on a train at the Tube station in south-west London during rush hour, injuring 30 people.
Joseph Case describes the moment he saw the man being arrested in Cardiff.