Police and security forces have prevented four attempts by terrorists to set off a bomb in the capital, revealed Mayor Ken Livingstone.
Livingstone said: "We have intercepted four attempts that were under plan to actually cause mayhem and take life in this city," revealed a report.
It was only due to increases in the number of police that the terrorists had been stopped, said the Mayor.
"It is a constant and enormous effort on the part of the police to ensure that these people do not get through," said Livingstone in the report. "Of course, inevitable, someone will get through, as we saw in the long history of terrorism relating to Ireland.
"But so far, because we've had that extra policing resource, we've been able to prevent that."
According to the report, Livingstone refused to give further details of the attacks, and said some of the cases were due to come before the courts.