An 18-year-old male has been arrested by police investigating the Parsons Green tube attack that injured 29 people.
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The man was arrested by Kent Police in the port area of Dover this morning under section 41 of the Terrorism Act.
He remains in custody at a local police station and will be transferred to a south London police station in due course.
Deputy Assistant Commissioner Neil Basu, Senior National Co-ordinator for Counter Terrorism Policing, said: “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.
“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.”
Anyone with information is urged to call the Anti-Terrorist Hotline on 0800 789 321 or, in an emergency, always call 999.