An 18-year-old man has been arrested by Kent Police in relation with yesterday's Parsons Green tube bomb, the Met Police have announced.
The arrest was made this morning in the port area of Dover, the police said. He remains in custody in a local police station but will be transferred to a south London location "in due course".
Home Secretary Amber Rudd will be chairing a meeting of the government's security officials later today.
Depite the progress made in the hunt for suspects, the police said their investigation was continuing. The UK's terror threat remains at the highest level of critical, after being lifted following the attack.
“We have made a significant arrest in our investigation this morning. Although we are pleased with the progress made, this investigation continues and the threat level remains at critical," said deputy assistant commissioner Neil Basu, senior national co-ordinator for counter terrorism policing.
The public should remain vigilant as our staff, officers and partners continue to work through this complex investigation. We are not, at this time, changing our protective security measures and the steps taken to free up extra armed officers remain in place.
This arrest will lead to more activity from our officers. For strong investigative reasons we will not give any more details on the man we arrested at this stage.
According to the Met Police, 30 people were injured in yesterday's attack but none fatally.
In a statement following the arrest, mayor of London Sadiq Khan said:
“The police investigation is ongoing and there will still be significant activity today and over the days ahead. I am sure I speak for London when I say we are incredibly grateful to the police and intelligence services for doing everything possible to keep Londoners safe.
“It is important we all remain alert and vigilant. There will be an increased police presence across London today and over this weekend, including additional armed officers. They are there to keep us safe.
“London will never be intimidated by terrorism. We will always defeat those who seek to harm us and destroy our way of life.”