A man has been found guilty of murdering 14-year-old schoolboy Daniel Anjorin with a samurai sword in Hainault last year.
Marcus Monzo has also been found guilty of three counts of attempted murder, wounding with intent and possession of an offensive weapon.
He showed no emotion as the verdicts were passed at the Old Bailey, from a jury of eight women and four men.
Monzo will be sentenced on Friday.
He was cleared of one count of attempted murder but found guilty of the lesser offence of wounding with intent to cause grievous bodily harm.
The attacks took place within just 20 minutes which Monzo targeted members of the public and police officers.