Jeremiah Adolajo has insisted that his brother - the convicted Woolwich murderer Michael Adebolajo - was not radicalised despite associations with radical preachers and the now disbanded group al Muhajiroun.
– Jeremiah adebolajo
It's a very tidy narrative to assume that we have this young Christian boy who was radicalised by these bogeymen-like figures - Anjem Choudary, Omar Bakri Muhammad - and while he went on this conveyor belt, as it were, of radicalisation and then the events of Woolwich happened. It's just not true.
Jeremiah also said that the security services were "putting a lot of pressure" on Adebolajo and were "really disrupting his life" right up to "a few months before" the Woolwich attack.
The brother of one of Lee Rigby's murderers has told reporters that the murder of a British soldier in Woolwich "won't be the last" such attack.
Jeremiah Adebolajo, who like his now-convicted brother Michael is a Muslim convert, said: "The events to me were inevitable. There was eventually going to be another attack which mentioned foreign policy as its justification."
Speaking to Al Jazeera's Investigations Unit, he said: "For every violent action is a violent reaction."
Jeremiah was banned from the Old Bailey "for security reasons" during some of his brother's trial.
The Metropolitan Police's Assistant Commissioner Cressida Dick, who is responsible for counter-terrorism, said her thoughts are with Fusilier Lee Rigby's family after his killers were found guilty of murder.
She told ITV News UK Editor Lucy Manning it was "an appalling act” on a “completely innocent young man with no chance to defend himself in broad daylight on a busy London street.”
When asked if a similar attack could happen again, she said: "It's our job to do everything we can to try to stop such attacks and we do have, I think, a very good record in this country.”
However Ms Dick said: "We cannot reduce the risk of something like this happening to absolute zero. We'll do everything in our power to do so."
Michael Adebolajo, one of the men convicted of the murder of Fusilier Lee Rigby, thought MI5 were "destroying his life" after allegedly being approached by the agency to become an agent, according to one of his friends.
A letter seen by ITV News outlined claims from Michael Adebolajo's family that British security services wanted to recruit the 29-year-old, and Abu Baraa believes those approaches became too much for the convicted killer.
In 2010, Michael Adebolajo visited Kenya and is believed to have been preparing to train and fight with al-Qaeda-linked militants in Somalia.
According to intelligence files seen by ITV News, he travelled to the country's coast and met a group under the surveillance of anti-terrorism police.
It is claimed they contacted a radical cleric for help to get to Somalia. That cleric told ITV News correspondent Rohit Kachroo: "Michael was a very nice young man - a man of strong character and if you look at him you believed in his cause."
"They were to join their fellow Mujahideens [Muslims who proclaim themselves warriors for their faith] in Somalia and to assist, put a stop to the oppression many of the Muslims in Somalia are going through."
Richard Taylor OBE, father of murdered schoolboy Damilola Taylor, mentored one of Fusilier Lee Rigby's killers as a young boy. He believes Michael Adebowale was radicalised during a period in jail.
He told ITV News: "I thought his going to prison would have reformed him and he'd come back and get back into the community with positive behaviour."
"Something must have gone wrong in prison, they must have indoctrinated him in the wrong way", he added.