One talk Adebolajo attended was at a Woolwich community center, he said, noting the group met in such locations because they were not welcomed in mosques. The very large majority of British Muslims reject Bakri Mohammed's views.
The radical cleric said that although they did not have many interactions, Adebolajo stood out because he was a new convert to the religion.
Bakri Mohammed said he had no contact with him after he left the UK.
Volley of shots
Dramatic video footage obtained by Britain's Daily Mirror newspaper, filmed from an apartment block overlooking the street, shows the moment when armed police arrived at the scene.
One of the attackers rushes at the police vehicle brandishing knives while the other aims a gun. Both are brought down by a volley of shots.
The firearms unit was called in after the initial alert because British police do not usually carry weapons. Witnesses remarked that the two attackers appeared to wait for the armed police to arrive, nearly 15 minutes after their assault on Rigby.
The two injured suspects remained in stable condition at separate South London hospitals Friday, the Metropolitan Police said.
The attack, which Cameron and others called an act of terror, stirred anxiety and alerts in Britain not seen since the summer of 2005, when coordinated bomb attacks struck London's public transport network.
An additional 1,200 police are now on London's streets to reassure the public, police said Thursday. Extra security is in place for military personnel and sites.
The Woolwich bloodshed spurred concerns not only about violence by Islamic extremists, but also about attacks targeting Muslims by people angered by Rigby's killing.
In Kent, police arrested a man on suspicion of "racially aggravated criminal damage" at a religious building. And on Wednesday night in Essex, a man with two knives was arrested after throwing a smoke grenade at the Al Falah Braintree Islamic Center and demanding someone come outside to answer to the Woolwich slaying, said the mosque's secretary, Sikander Sleemy.
Members of the far-right English Defence League clashed with police late Wednesday, with a tweet from its official account touting that "it's fair to say that finally the country is waking up!:-) NO SURRENDER!"
"Don't listen to the Government cover ups, The lies about Islam being peaceful," read another EDL tweet Thursday.
Political and social commentator Mohammed Ansar appealed for "a sense of calm (and) perspective" after what he called "a really, really heinous act of, I would say, criminality, ... not terrorism."
"What we don't need are knee-jerk reactions ... to really ratchet up tensions and really stoke and inflame anxieties within communities," he told CNN.
Nearly 100 senior British imams together issued a statement sharply condemning the "sick and barbaric" killing, which they said had spurred "hate-fueled individuals" to attack mosques and Muslims. The group called for action and dialogue to prevent attacks by extremists of all ilks.
"We (urge) our fellow citizens not to be taken in the mindless rantings of the (few) extra extremists in our midst," they said. "We, the British people, are not so easily fooled; nor are we so easily divided."