A teenager who was on his way to behead a British soldier with a 12in knife when he was arrested, has been found guilty of preparinga terrorist act.
Brusthom Ziamani, 19, was also carrying a hammer and an "Islamic flag" when he was arrested in London in August 2014.
The court heard he had been inspired by the murder of Fusilier Lee Rigby in 2013, researched Army c adet bases and boasted of a plot to "kill soldiers".
Ziamani, of Camberwell, London, will be sentenced on 20 March.
He was arrested in east London at about 16:30 BST on 19 August as part of a joint police and MI5 intelligence operation.
Earlier that day, police say he visited his former girlfriend, where he showed her the knife and hammer and told her he intended to attack and kill soldiers.
Commander Richard Walton, from the Metropolitan Police's counter-terrorism command, said the teenager's plot "starkly illustrates" one of the threats facing the UK.
"Ziamani was an impressionable young man who became radicalised then rapidly developed an extremist, violent mindset," he said.
"Over a series of months, he ultimately developed a desire to carry out a terrorist attack on British soldiers."
Mr Walton added that police had probably prevented a "horrific terrorist attack taking place on the streets of London".
The jury at London's Old Bailey convicted Ziamani of preparing an act of terrorism on or before 20 August last year after deliberating for more than a day.
Ziamani's barrister, Naeem Mian, told Judge Timothy Pontius that the teenager could expect the sentence to be one of "considerable length" but pointed to the fact that he was still "a young man who has no previous convictions at all".
The judge adjourned the case until next month to consider the sentence.
Ziamani, who was dressed in a grey and blue tracksuit, made no reaction to the verdict and sat impassively in the dock before being led away.
Ziamani converted to Islam in April 2014 and his extremist views "rapidly developed over a few months", the Met Police say.
During the trial, jurors heard how Ziamani had fallen in with members of al-Muhajiroun - an extremist organisation - after he was "kicked out" of home after converting to Islam.
Police say the group played a "major role in influencing and shaping his radical views".