The terror threat faced by London is "fairly disorganised" and involves small groups of disaffected people, according to the capital's mayor.
The mayor had spent four years planning a terror threat response
Ken Livingstone told the BBC London was not the focus of a "great organised international conspiracy with orders flowing down the chain".
But he said there had been 10 attempted attacks since 11 September 2001, two of which had come since the 7 July bombs.
MPs recently stated a "deadly threat" to the UK's transport system remained.
Mr Livingstone, speaking on Radio 4's PM programme, said there had been "a couple" of attempted attacks since suicide bombers killed 52 people on London's Tubes and a bus on 7 July.
He added there were eight other attempts between the 11 September attacks on the US and 7 July this year.
"Largely what you're talking about is fairly disorganised and small groups of disaffected people," he said.
The mayor said his team had spent four years planning a response to any terror attack on the capital.
He said the disaster response had functioned "like clockwork" following the 7 July attacks.
In November the Commons Transport Committee warned the UK's transport systems were "highly vulnerable to terrorist attack".
"The London Underground and bus bombings of 7 July were a savage reminder of current terrorist dangers. The deadly threat remains current," the MPs' report stated.