A seventh suspect in the Parsons Green terror attack has been arrested, police said on Monday.
The man, a 20-year-old, was detained in Cardiff after a dawn raid on a property in the city.
London’s Metropolitan Police said its officers carried out the arrest at 6 a.m. local time (BST), alongside Welsh counter-terror police officers and members of South Wales Police.
The man was taken to a police station in south London, where he is being questioned alongside the other suspects still under arrest.
Police have not released the man's identity. He is the fourth person to be arrested in Wales, after three men were detained in the city of Newport last week.
On Friday police charged Ahmed Hassan, an 18-year-old, with planting the bomb with the intention of murdering passengers on the District Line train bound for central London earlier this month.
Hassan appeared in court on Friday, but spoke only to confirm his identity. He is due in court again, at London's Old Bailey, on October 13.
Here's a full breakdown of the seven arrests:
September 16, 7:50 a.m., Port of Dover: Kent Police arrest Ahmed Hassan, 18. Later charged with planting the bomb. September 16, 11:50 p.m., Hounslow, west London: Met Police arrest 21-year-old Yahyah Farroukh. Later released without charge. September 19, 7:00 p.m., Newport, South Wales: Met Police and Gwent Police arrest a 25-year-old man. Still in custody. September 20, 5:10 a.m., Newport, South Wales: Met Police and Gwent Police arrest a 48-year-old man. Later released without charge. September 20, 5:10 a.m., Newport, South Wales: Met Police and Gwent Police arrest a 30-year-old man at the same address. Still in custody. September 21, 12:05 a.m., Thornton Heath, south London: Metropolitan Police arrest a 17-year-old boy. Later released without charge. September 25. 6:00 a.m., Cardiff, Wales: Met Police and South Wales Police arrest a 20-year-old man. Still in custody.
Police can detain terror suspects for a maximum of 14 days before charging them or letting them go.