LONDON (AP) — British police are searching a home in the London suburb of Stanwell linked to the arrest of the second suspect in the subway bombing.
Police said Sunday the search is connected to the arrest late Saturday of a 21-year-old man taken into custody under the Terrorism Act. He is the second man arrested on suspicion of being involved in Friday’s attack on a London subway train that injured 30 people.
Stanwell is about 15 miles (25 kilometers) southwest of central London, heading toward Heathrow Airport.
Police had earlier searched a house in Sunbury believed to be linked to the first suspect, who was arrested at the Dover ferry port.
Two men are now in custody for possible roles in the bombing attack on a rush-hour subway train Friday morning that injured 29 people in London.
An 18-year-old man was arrested Saturday in the departure area of the port of Dover, where ferries leave for France.
The two arrests indicate police and security services believe the attack at the Parsons Green station was part of a coordinated plot, not the act of a single person.
“We are still pursing numerous lines of enquiry and at a great pace,” counter-terrorism coordinator Neil Basu of the London police said late Saturday.
Britain’s terror threat level remains at “critical” — the highest level — meaning that authorities believe another attack is imminent.
The official threat level is not likely to be lowered until police believe all of the plotters have been taken into custody.
Police on Saturday launched a massive armed search in the southwestern London suburb of Sunbury. Neighbors were evacuated in a rush from the area and kept away for nearly 10 hours before they were allowed to return to their homes.
The Islamic State says the attack Friday was carried out by one of its affiliated units. The improvised explosive device placed on the subway train only partially detonated, limiting the number of injuries.
Home Secretary Amber Rudd said the casualties would have been far higher if the bomb had fully detonated. Frustrated by the string of terrorist attacks in recent months, she said officials will have to work harder to make bomb components more difficult to obtain.
Britain has endured four other attacks this year, which have killed a total of 36 people. The other attacks in London — near Parliament, on London Bridge and near a mosque in Finsbury Park in north London — used vehicles and knives to kill and wound.