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Agence France-Presse

British police raided a home near London on Saturday just hours after making their first arrest in the investigation into the bombing of an underground train a day earlier.
An 18-year-old man was detained at Dover port, one of the country’s main links to Europe, with officers describing the development as a significant step in their investigation.
They later announced that the raid was under way.
“Police officers have evacuated and are searching a residential address in Sunbury, Surrey,” a statement said.
Authorities declined to release further details of the man because of “strong investigative reasons”.
Thirty people were treated in hospital after the bomb detonated in a packed train carriage at Parsons Green station in southwest London on Friday morning, in what was Britain’s fifth terror attack in six months.
The improvised explosive device failed to detonate fully, according to media reports, but the blast inflicted flash burns on passengers while others fled in panic.
UK raises threat level to critical after London train blast

“This arrest will lead to more activity from our officers,” police said, adding that the teenager was being held under anti-terror legislation.
In a statement, antiterrorism chief Mark Rowley said officers were “chasing down suspects”.
“Somebody has planted this improvised explosive device on the Tube. We have to be open-minded at this stage about him and potential associates,” he said.

Friday’s incident – claimed by Islamic State (IS) – led to the national threat level being raised to critical, meaning another attack could be imminent. The last time the warning was used was after a deadly suicide bombing at Manchester Arena, also claimed by IS, in May.
In a statement, IS said a “detachment” had carried out the latest London attack.
Prime Minister Theresa May condemned Friday’s attack as “cowardly”, and said troops would take on responsibility for guarding key sites, including nuclear facilities, to free up police.
An additional 1,000 were deployed, with more police added to the transport network and streets across Britain.
‘Fireball flew down carriage’: terror blast on London train leaves passengers burnt and trampled

#parsonsgreen pic.twitter.com/0OUV819EtE
— Sylvain Pennec (@sylvainpennec) September 15, 2017

<![CDATA[// ><!]]>

May said the home-made explosive device was “clearly intended to cause significant harm”.
The remnants of the bomb, which looked to be in a bucket used by builders with cables coming from it, were examined by forensic scientists but no further details were released. British media reported that it had a timer that failed to properly detonate.
Otso Iho, a senior analyst at Jane’s Terrorism and Insurgency Centre, said the attack showed a “continued high intent but low capability” in the terrorism threat in Britain.
Hans Michels, a professor of chemical engineering at Imperial College, said the flash flame “suggests that the explosion was only partly successful”.
Victims were treated in hospital although health authorities said none were in a life-threatening condition. Three remained in care on Saturday morning.

Witnesses described the chaos after Friday’s explosion.
Charlie Craven said he heard a “massive bang” and “an orange sort of fireball encompassing the whole Tube coming towards you”.
Lauren Hubbard described it as “a wall of fire”.
Twitter user @Rrigs posted pictures of a white bucket smouldering on the train and described how a “fireball flew down carriage and we just jumped out open door”.
Louis Hather, 21, had been travelling to work and was three carriages down from the explosion.
“I could smell the burning. Like when you burn plastic,” he said.
He was trampled on as passengers stampeded out of the station and his leg was badly cut and bruised.
Four previous attacks in London and Manchester this year have claimed the lives of 35 people. Three of those attacks involved a vehicle ploughing into pedestrians.

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A police officer and a soldier stand at the entrance to Horse Guards Parade after it was closed because of the heightened security following an explosion on an underground train on Friday in London. Photo: Reuters

A passenger walks onto the platform at Parsons Green subway station after it was reopened following a terrorist attack on a train at the station yesterday in London, Saturday, Sept. 16, 2017. British authorities are searching for suspects in the London subway blast that injured more than two dozen people as hundreds of soldiers are being deployed across the country. (AP Photo/Tim Ireland)

Armed police officers patrol in Westminster, in London, Britain, September 16, 2017. REUTERS/Peter Nicholls

(FILES) This file photo taken on September 27, 2014 shows This picture shows a general view of the fright terminal at the Port of Dover in Dover. British police arrested an 18-year-old man on September 16, in connection to their investigation into the bombing of a packed London Underground train. "The 18-year-old man was arrested by Kent Police in the port area of Dover this morning, Saturday, 16 September, under section 41 of the Terrorism Act," police said in a statement describing the arrest as "significant". / AFP PHOTO / Andrew Cowie

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An additional 1,000 troops were deployed, with more officers added to the transport network and streets after 30 people were injured in the bombing


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British police raid house, arrest man over terror blast on London train as Islamic State claims attack

.css-1c6uqr6{color:inherit;font-weight:inherit;font-size:inherit;font-family:inherit;line-height:inherit;overflow-wrap:break-word;}An additional 1,000 troops were deployed, with more officers added to the transport network and streets after 30 people were injured in the bombing

An additional 1,000 troops were deployed, with more officers added to the transport network and streets after 30 people were injured in the bombing