Umar Haque, 25, has been found guilty of training an “army of children” to attack over 30 targets in London.
His plan was to use cars filled with explosives to strike targets like the Queen’s guards, Big Ben and courts.
He secretly trained and groomed children as young as 11.
Haque, who was not qualified but still was a teacher at independent Muslim school Lantern of Knowledge in Leyton, showed IS propaganda videos to his pupils. Where he almost managed to radicalise 110 students.
He was found guilty by member of the jury at the old bailey.
He was dragged from the dock by officers as he ranted: “You will clearly see Islamic State establish itself in the Arabian peninsula and that droughts will affect Europe and America. You will remember my warning.”
Commander Dean Haydon, of the Met’s Counter Terrorism Command, said: “Haque’s plans were ambitious, long-term but aspirational.
“His aim was to create an army of children to assist with more terrorist attacks throughout London.
“It was apparent he was in the early stages of this long-term attack plan at multiple sites using multiple weapons and assisted by children he had radicalised.
“He tried to prepare the children for martyrdom by making them role play attacks. Part of that role play was re-enacting attacking police officers.
“He is a really dangerous individual. He could have moved at any time.”
Mr Haydon said “crucial work” was ongoing to safeguard 35 children affected by Haque’s indoctrination, which had left them “almost paralysed with fear”.
After officers broke their “wall of silence”, parents at the £3,000-a-year Lantern of Knowledge school were “horrified”.
MI5 were keeping an eye on Haque after he went to Turkey in 2016, they bugged Haque to listen to his conversations.
One conversation was read to the jury where Haque said: “We are here to cause terror, my brother. We are a death squad sent by Allah and his messengers to avenge my Arab brothers’ blood …”
In another conversation he bragged about successfully recruiting 16 children and training them to die as martyr.
Mark Heywood, prosecuting, said Haque targeted areas of civilians and police.
A target list written by Haque was shown to the jury, his targets included Transport of London, Westfield, Heathrow, Big Ben, Head offices of Britain First and English Defence League, City banks, Shia Muslims, The Queens Guard and Courts.
One of the youngsters later told police: “Umar has been teaching us how to fight, do push-ups, given strength and within six years he was planning to do a big attack on London.
“He wants a group of 300 men. He’s training us now so by the time I’m in Year 10 (aged 14-15) we will be physically strong enough to fight.”
Abuthaher Mamun, 19, and Muhammad Abid, 27, were convicted of helping Haque.
The alleged armourer Nadeem Patel, 26, who had previously pleaded guilty to possessing a handgun, was acquitted of plotting with Haque.
The four defendants will be sentenced at a later date.
Patel was sentenced to 16 months imprisonment for possession of a blank-firing Walther 999 handgun, adapted to discharge gas.
He has already served eight months on remand and the judge said he should be released “forthwith”.
“The context in which this prohibited firearm was held is your drug dealing, albeit minor drug dealing,” he told Patel.
But he added: “He has had to sit through a long, gruelling and stressful trial, having found himself tangled up with a terrorist.”