Tony Blair has insisted the war in Iraq was not to blame for the 7/7 bombings that killed 52 people and left hundreds injured.
On the 10th anniversary of the worst terrorist attack seen on British soil, the former Prime Minister said we must “look at this in the bigger context” to understand why British youths detonated four bombs across London’s transport network.
He said attacks in countries that did not participate in the decision to invade Iraq in 2003, such as France, as well as other nations such as Norway, Belgium and Tunisia that have “no real foreign policy presence” proved his point.
Mr Blair, who was in power at the time of the 7/7 bombings, said the battle to combat Islamic extremism must be fought on the ground but stopped short of recommending that British troops should be deployed in Isis-controlled territory.
He warned that the threat of terrorism will continue to “intensify” if Western nations failed to unite to form a common strategy to fight the “long, hard struggle”.
Speaking during an interview with his former Cabinet colleague Dame Tessa Jowell on LBC Radio, Mr Blair said: "9/11 in New York was probably the first really large scale terrorist attack. Obviously, we had certain foreign policy responses to that.
"The problem is that even those countries that didn't participate in Iraq at all, like France, are now subject to these attacks.
"We have seen them most recently in Tunisia. Countries like Belgium or Norway, who are countries that have no real foreign policy presence, are also subject to this.
In pictures: The 10th anniversary of the 7/7 London bombings
In pictures: The 10th anniversary of the 7/7 London bombings
1/26 7/7 bombings anniversary
Security staff and workers from Hyde Park observe a minutes silence at the 7/7 memorial in Hyde Park
2/26 7/7 bombings anniversary
People pause for a minutes silence at Kings Cross Underground station in London, as Britain remembers the July 7 attacks amid a welter of warnings about the enduring and changing threat from terrorism a decade on
3/26 7/7 bombings anniversary
Members of staff working within the grounds observe a minutes silence to commemorate the tenth anniversary of the July 7 terrorist attacks at the All England Lawn Tennis and Croquet Club, Wimbledon
4/26 7/7 bombings anniversary
Police officers within the grounds observe a minutes silence to commemorate the tenth anniversary of the July 7 terrorist attacks at the All England Lawn Tennis and Croquet Club, Wimbledon
5/26 7/7 bombings anniversary
Representatives from 7 Company, Coldstream Guards and HQ London District join the national act of remembrance for the 7th July bombings 10th year anniversary beside the Ministry of Defence Main Building in central London and led by Rabbi Major Reuben Livingstone
6/26 7/7 bombings anniversary
People observe a nationwide minute's silence on the 10 year anniversary of the 7/7 London attacks which killed 52 people, facing in the direction of a plaque and flowers laid at the location of where a suicide bomber blew themselves up during the morning rush hour on a bus in Tavistock Square
7/26 7/7 bombings anniversary
George Psaradakis (centre), the driver of the number 30 bus which was blown up in Tavistock Square, looks at floral tributes left close to the scene of the bombings in London
8/26 7/7 bombings anniversary
People stop to observe a minute's silence at Aldgate underground station, in memory of the victims of the July 7 bombings
9/26 7/7 bombings anniversary
Flowers left by the July 7 memorial plaque at Aldgate Station, London, which names those who were killed in the bombings at the station
10/26 7/7 bombings anniversary
Members of various religious groups pray during a service in St Paul's Cathedral, to commemorate the tenth anniversary of the London Bombings in London
11/26 7/7 bombings anniversary
Poppy petals fall from the roof during a service in St Paul's Cathedral, to commemorate the tenth anniversary of the London Bombings in London
12/26 7/7 bombings anniversary
A police officer looks at flowers left at Kings Cross Underground station in London
13/26 7/7 bombings anniversary
Flowers left by the July 7 memorial plaque at Aldgate Station
14/26 7/7 bombings anniversary
Boris Johnson and David Cameron place wreathes at the July 7 memorial in Hyde Park, London
15/26 7/7 bombings anniversary
David Cameron and Boris Johnson take part in a wreath laying ceremony in London's Hyde Park, in memory of the 52 victims of the 7/7 London attacks
16/26 7/7 bombings anniversary
David Cameron and Boris Johnson during a ceremony at the memorial to the victims of the July 7, 2005 London bombings, in Hyde Park
17/26 7/7 bombings anniversary
From left: Paul Crowther, Chief Constable, British Transport Police, Adrian Leppard, Commissioner City of London Police, and Sir Bernard Hogan-Howe, Commissioner of the Metropolitan Police, carry wreathes at the July 7 memorial in Hyde Park
18/26 7/7 bombings anniversary
People look at flowers left in Tavistock Square
19/26 7/7 bombings anniversary
7/7 survivor Gill Hicks (centre) arrives with flowers at Russell Square tube station
20/26 7/7 bombings anniversary
People embrace outside Edgware Road tube station, as Britain remembers the July 7 attacks
21/26 7/7 bombings anniversary
A lady carrying flowers leaves Russell Square tube station
22/26 7/7 bombings anniversary
Faith leaders promote religious unity in central London, as Britain prepares to mark 10th anniversary of the 7/7 London bombings in which 52 people were killed
23/26 7/7 bombings anniversary
Gill Hicks, (L) a survivor of the 7/7 London terror attacks, embraces police constable Andrew Maxwell outside Kings Cross Station in London, during an event to launch a walk by faith leaders promoting religious unity ahead of the anniversary of the attacks
24/26 7/7 bombings anniversary
A memorial dedicated to the 52 people that were killed during the 7/7 terror attacks in London is pictured in London's Hyde Park
25/26 7/7 bombings anniversary
The July 7 memorial in Hyde Park
26/26 7/7 bombings anniversary
A memorial dedicated to the 52 people that were killed during the 7/7 terror attacks in London is cleaned in London's Hyde Park
"This is a global problem ... and the only way of dealing with it ultimately is for people to come together whatever their faith background and say we are united against this terrorism, and to say we are not going to allow anyone to excuse themselves by saying the slaughter of totally innocent people is somehow a response to any decision by any government.
"It is the responsibility of those who carry out the attacks of terrorism and those who incite them."
In a separate interview with the BBC this morning, Mr Blair suggested a united group of nations in the West needed to have "the means of combating these people and combating them on the ground".
"I don't criticise Western leadership today but I do say this is a long hard struggle and we've got to be prepared to engage over a long period of time because at the time of 7/7, we faced people who had been radicalised over a period of time," he said.
"But we face a situation today where you have fighters coming back from Syria who are our own citizens. You have training camps actually in Libya not just in Syria, in Iraq and elsewhere and this threat is not going away. It will intensify in time to come."
Events throughout today are remembering the victims of the 7/7 bombings across the capital, with a national minute's silence to be held at 11.30am. David Cameron and Boris Johnson will join the families of victims at the Hyde Park 7/7 memorial, before attending a service at St Paul's cathedral.
At 11.30am today, the country comes together to remember the victims of one of the deadliest terrorist atrocities on mainland Britain.— David Cameron (@David_Cameron) July 7, 2015