The suicide bomb plot hatched in Yorkshire

The terrorists responsible for the Tube and bus attacks in London have been revealed as home-grown suicide bombers.

The four young British men, all thought to be of Pakistani origin, are believed to have blown themselves up with rucksack bombs on Thursday, killing at least 52 people.

Three of the bodies of the terrorists responsible for what was the first suicide bombing in western Europe have been identified, while a fourth is thought to be among the remains in the wreckage on the Piccadilly line between King's Cross and Russell Square.

Police raids at six homes in north Yorkshire yesterday also led to one arrest. But senior security sources warned last night that they suspected al-Qa'ida planners ­ bomb-makers and organisers ­ were still at large and further suicide bombings were likely. The four men, including one teenager, all from Leeds and Dewsbury in West Yorkshire, were not considered Islamic extremists and were not thought to have significant links with terrorism.

The realisation that British nationals are prepared to make suicide attacks has transformed the way the country will have to view security.

"What we considered normal has changed forever," said a senior security source.

Security measures at all public places will have to be rethought. Tough new security laws are also expected to be introduced to try to combat the threat.

Anti-terrorist officers raided houses in Leeds and Dewsbury where they found a "bomb factory" believed to belong to at least one of the terrorists.

Explosives were also found in a car at Luton railway station, which is thought to have been used by the bombers to drive from Leeds on Thursday.

Police searched Colenso Mount in Leeds, the home of Hasib Hussain, believed to be responsible for the bomb on the No 30 bus that blew up in Tavistock Square. They also raided Colwyn Road in Leeds, the home of Shahzad Tanweer, believed to be responsible for the Aldgate blast.

It is understood that 19-year-old Hussain's driving licence and credit cards were found in the wreckage of the No 30 bus. The bus bomber is thought to have failed to get on a Northern line train so boarded a bus instead. For some reason he detonated his bomb nearly an hour after his fellow terrorists had exploded theirs.

Tanweer, age 23, the man believed to have been responsible for the Aldgate blast, was seen by police officers on CCTV footage. Scotland Yard said the footage of the four men at King's Cross station shows them with their rucksack bombs minutes before the attacks.

Tanweer and Hussain's houses were among six raided by West Yorkshire Police. The men are known to have been missing since last week. Tanweer, who was said by neighbours near his home in the Beeston area of Leeds, to have been a university graduate and keen local cricketer, had not been at home since last week, which had been a cause of concern for his father Mohammed, who runs a chip shop near the family home.

His friend, Azzy Mohammed, said: "We played cricket together and I could not imagine him doing anything to hurt anyone as he has a very strong family."

Hussain, from the Holbeck of Leeds, is understood to have been the subject of attempts at discipline by his parents after becoming difficult to control in his adolescence. But he became devoutly religious 18 months ago and is believed to have gone to London last week, since which time he has not been seen or contacted,despite the efforts of his older brother.

Detectives evacuated 500 homes before carrying out a controlled explosion in the Burley district of Leeds.

The breakthrough in the investigation came at 8pm on Monday when detectives found a CCTV picture of the four bombers at King's Cross station 20 minutes before they blew themselves up.

But a senior security source warned last night: "We have not got the plotters or planners. Al-Qa'ida methodology is to put someone into the country ­ they do the preparation and they are out the door."

He said the fear remained that whoever helped the four bombers has recruited and trained other British suicide attackers. "How many other clean skins are waiting in the wings?" he said.

Only one of the three identified suicide bombers had any known connection to al-Qa'ida suspects, and it was a very low level of association, according to security sources.

Hours after the Leeds raids, police evacuated Luton railway station and car park as they recovered two vehicles, one of which was later found to have explosives inside.

Deputy Assistant Commissioner Peter Clarke, head of Scotland Yard's anti-terrorist branch, said: "The investigation is moving at great speed.

"We are trying to establish the movements of the suspects in the run-up to last week's attack and specifically to establish whether they all died in the explosions."

Assistant Commissioner Andy Hayman, leading the police hunt, said the bombings were the work of "extremists and criminals".

Tony Blair issued a defiant statement saying: "Together, our modern, diverse and tolerant country will ensure the terrorists fail in their attempts to destroy the way of life we all share and value."

The final death toll from Thursday's attacks is expected to rise above 52, with police assigning family liaison officers to more than 70 families.

Start your day with The Independent, sign up for daily news emails
Life and Style
love + sex A new study has revealed the average size - but does that leave men outside the 'normal' range being thought of as 'abnormal'?
Arts and Entertainment
TV
Voices
The Palace of Westminster is falling down, according to John Bercow
voices..says Matthew Norman
Sport
Steve Bruce and Gus Poyet clash
football
ebooks
ebooksA special investigation by Andy McSmith
News
Graham Norton said Irish broadcaster RTE’s decision to settle was ‘moronic’
TV
Arts and Entertainment
Jake and Dinos Chapman were motivated by revenge to make 'Bring me the Head of Franco Toselli! '
arts + ents Shapero Modern Gallery to show explicit Chapman Brothers film
Arts and Entertainment
Kurt Cobain performing for 'MTV Unplugged' in New York, shortly before his death
music Brett Morgen's 'Cobain: Montage of Heck' debunks many of the myths
Life and Style
life
Sport
Brendan Rodgers
football The Liverpool manager will be the first option after Pep Guardiola
News
Amazon misled consumers about subscription fees, the ASA has ruled
news
Arts and Entertainment
Myanna Buring, Julian Rhind-Tutt and Russell Tovey in 'Banished'
TV Jimmy McGovern tackles 18th-century crime and punishment
Arts and Entertainment
Paul Whitehouse as Herbert
arts + ents
Latest stories from i100
Have you tried new the Independent Digital Edition apps?

Day In a Page

Syrian conflict is the world's first 'climate change war', say scientists, but it won't be the last one

Climate change key in Syrian conflict

And it will trigger more war in future
How I outwitted the Gestapo

How I outwitted the Gestapo

My life as a Jew in wartime Berlin
The nation's favourite animal revealed

The nation's favourite animal revealed

Women like cuddly creatures whilst men like creepy-crawlies
Is this the way to get young people to vote?

Getting young people to vote

From #VOTESELFISH to Bite the Ballot
Poldark star Heida Reed: 'I don't think a single bodice gets ripped'

Poldark star Heida Reed

'I don't think a single bodice gets ripped'
The difference between America and Israel? There isn’t one

The difference between America and Israel? There isn’t one

Netanyahu knows he can get away with anything in America, says Robert Fisk
Families clubbing together to build their own affordable accommodation

Do It Yourself approach to securing a new house

Community land trusts marking a new trend for taking the initiative away from developers
Head of WWF UK: We didn’t send Cameron to the Arctic to see green ideas freeze

David Nussbaum: We didn’t send Cameron to the Arctic to see green ideas freeze

The head of WWF UK remains sanguine despite the Government’s failure to live up to its pledges on the environment
Author Kazuo Ishiguro on being inspired by shoot-outs and samurai

Author Kazuo Ishiguro on being inspired by shoot-outs and samurai

Set in a mythologised 5th-century Britain, ‘The Buried Giant’ is a strange beast
With money, corruption and drugs, this monk fears Buddhism in Thailand is a ‘poisoned fruit’

Money, corruption and drugs

The monk who fears Buddhism in Thailand is a ‘poisoned fruit’
America's first slavery museum established at Django Unchained plantation - 150 years after slavery outlawed

150 years after it was outlawed...

... America's first slavery museum is established in Louisiana
Kelly Clarkson: How I snubbed Simon Cowell and become a Grammy-winning superstar

Kelly Clarkson: How I snubbed Simon Cowell and become a Grammy-winning superstar

The first 'American Idol' winner on how she manages to remain her own woman – Jane Austen fascination and all
Tony Oursler on exploring our uneasy relationship with technology with his new show

You won't believe your eyes

Tony Oursler's new show explores our uneasy relationship with technology. He's one of a growing number of artists with that preoccupation
Ian Herbert: Peter Moores must go. He should never have been brought back to fail again

Moores must go. He should never have been brought back to fail again

The England coach leaves players to find solutions - which makes you wonder where he adds value, says Ian Herbert
War with Isis: Fears that the looming battle for Mosul will unleash 'a million refugees'

The battle for Mosul will unleash 'a million refugees'

Aid agencies prepare for vast exodus following planned Iraqi offensive against the Isis-held city, reports Patrick Cockburn