Police have arrested a second man in connection with Friday's attack on a subway in London, the BBC reported.
Police arrested the 21-year-old Saturday night in west London. He is in custody in south London, police said.
"He was arrested under section 41 of the Terrorism Act and taken to a south London police station where he remains in custody," police said in a statement Sunday.
The Associated Press reported Sunday that London police were searching a home in the suburb of Stanwell that was linked to the second suspect.
An 18-year-old man was arrested Saturday on terror offenses in connection with Friday's attack, the BBC reported.
Home Secretary Amber Rudd told the BBC that the second arrest suggests the attacker was not "a lone wolf.”
Rudd said there was "no evidence" to suggest that the Islamic State, which claimed responsibility for the incident, were behind the attack.
"But as this unfolds and as we do our investigations, we will make sure we find out how he was radicalised if we can," she said.
The 18-year-old was detained in the port area of Dover on Saturday by Kent Police and is being held at a local station.
Metropolitan Police Deputy Assistant Commissioner Neil Basu said the arrest was "significant, but the terror threat level remains at "critical."
Thirty people were injured after the explosion on a train at Parsons Green, the BBC reported.
Most people were treated for minor injuries and have been released, the London Ambulance Service said. Of the 30 people injured in Friday's attack, one remains in the hospital, NHS England told the BBC.
Basu said the force was not changing its "protective security measures," adding that steps were still being taken to free up extra armed officers.
"This arrest will lead to more activity from our officer,” he said. "For strong investigative reasons we will not give any more details on the man we arrested at this stage."
British authorities lowered the terrorist threat level from “critical” to “severe” on Sunday.
The Parsons Green station in southwest London reopened at 1:30 a.m. on Saturday, more than 17 hours after the explosion.
The Islamic State group claimed responsibility for the bomb, which was detonated at 8:20 a.m.
It is understood the device had a timer, but Frank Gardner, the BBC's security correspondent,,said the bomb appeared not to have gone off properly.
Had it worked as intended, it would have killed everyone around it and maimed everyone in the train carriage for life, he said.
The Met said it had spoken to 45 witnesses so far and received 77 images and videos from the public, the BBC reported. Officials urged people to get in touch with any information and to upload footage to www.ukpoliceimageappeal.co.uk.
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