Third suspect arrested over London subway station blast

A woman injured in Friday's subway blast in London being escorted by police

Police have not provided details about the extensive search, which began two hours after an 18-year-old suspect in the subway bombing was arrested at Dover's ferry port. Both are being questioned in a south London police station.

"The arrest was carried out by officers from the Met's Counter Terrorism Command, supported by colleagues from Gwent Police and the Welsh Extremism and Counter Terrorism Unit (WECTU)", the spokesman said.

He was charged under section 41 of the UK's Terrorism Act.

A critical threat level means another attack is "expected imminently", while a severe threat indicates an assault is highly likely.

Meanwhile, closed-circuit television images, acquired by ITV News and broadcast Sunday, appeared to show a person walking with a Lidl shopping bag in the suburb of Sunbury before Friday morning's attack at Parsons Green station that injured 30 people in southwest London.

Ronald Jones, 88, and his wife Penelope Jones, 71, have been honored by Queen Elizabeth II for their work with children in need of a stable home.

The older suspect was named as Yahyah Farroukh, a native of Syria - and the younger suspect, who's not yet been identified, moved to Britain from Iraq at age 15 after his parents died.

Suleman Sarwar, co-owner of Aladdin's Fried Chicken in Hounslow, said Farroukh worked there and was arrested by police Saturday night at the end of his shift.

Commuters returned to Parsons Green station Monday for the first morning rush hour since the bombing.

As NPR reported on Friday, 29 people were injured at the Parsons Green subway station in Fullham when an explosion went off in a train vehicle.

Interior minister Amber Rudd said the two arrests suggested it was not a "lone-wolf" attack but there was no evidence IS was involved.

Previous attacks in Britain this year at Westminster Bridge, London Bridge and Finsbury Park as well as a blast at an Ariana Grande concert in Manchester killed dozens of people and injured more than 150 others.

The Islamic State group claimed responsibility for the explosion.