A video released on Friday showed Michael Adebolajo, who killed a British soldier in London, charging at a policeman before he was shot and injured.
Adebolajo beheaded soldier Lee Rigby, 25, on Wednesday in retaliation for what he said was the killing of Muslims by the British army.
Adebolajo was accompanied by Michael Adebowale, 22, who tried to attack police officers who arrived to the scene.
Sheikh Omar Bakri Mohammed, the founder of the al-Muhajiroun movement which was banned in Britain under anti-terror laws told Al Arabiya he does “not oppose what [Adebolajo] did.”
“I didn’t teach him to kill, neither did I give him an encouraging or hate-loaded lesson, but it seems that he acted alone,” Bakri said.
Adebolajo came from a Nigerian Christians background converted to Islam a decade ago.
“When someone settles in a non-Muslim country, this means that he is in a peace pact with its people, and both parties should refrain from aggressing one another,” Sheikh Bakri said.
He added that he thinks that Adebolajo decided “to free himself from this peace pact.”
“I am against the method used in killing the victim [Rigby].”
Britain's intelligence services came under pressure on Friday to explain how they let the two Islamic extremists slip through their net.
Adebolajo Adebowale, who remained under armed guard in hospital after being shot by police at the scene, were known to the intelligence services but were reportedly assessed as not posing a deadly threat.
The distraught wife of the murdered soldier Rigby said the family found it hard to accept that the 25-year-old had been killed not in a war zone but on the streets of his own country.
A huge pile of floral tributes was building up outside the barracks in Woolwich, south London, where Rigby was brutally attacked on Wednesday afternoon.