Former classmates of London Bridge terrorist Usman Khan have revealed the maniac laughed as he watched harrowing footage of the 9/11 attacks on his mobile phone.

The ex-pupils said he would watch the sick clips on repeat - including ones where victims could be seen plummeting to their deaths - as he made noises imitating the crashing planes.

They watched how the bullied pupil turned into an Islamist fanatic while at Haywood High School in Burslem, in Stoke-on-Trent.

Their accounts come one week after convicted terrorist Khan, 28, went on a bloody rampage in the heart of the capital where he knifed two people to death .

But, it wasn’t a surprise for one of Khan’s former classmates to learn the oddball was behind the massacre.

The sicko watched clips of 9/11 on repeat

He said: “Khan used to sit with his mates watching footage of the Twin Towers getting hit on a mobile phone. He’d laugh at the people forced to jump to their deaths.

“And he would make noises imitating the sound of a plane flying and then crashing. The 9/11 stuff stuck sharply in our heads. It was disgusting.

“Khan was reported because it was really offensive. But nothing was ever done. You knew back then he wasn’t wired the right way.”

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Khan was widely bullied for his poor personal hygiene, potbelly and his facial hair that led him to being called King Kong.

The oddball went on to become an Islamic extremist

He even had a picture of 9/11 mastermind Osama bin Laden inside his school planner - further proof of his fanatical admiration for terrorists.

The ex-pupil, now 29, added: “He was a big lad and got bullied constantly because of his facial hair. But it was his body odour which was the main thing. He stank and he got ridiculed for it.

Usman Khan attended Haywood Academy in Stoke-on-Trent

“He wasn’t popular and he never stood out. He was a just this fat kid in the background. If it wasn’t for his fascination with 9/11 I’d have completely forgotten about him.”

When Khan left school in 2007, he started preaching extremist Islamic teachings and was seen waving al-Qaeda flags.

In 2010, Khan and eight other men were arrested by police over a plot to blow up the London Stock Exchange and bomb pubs in his home town.

They were all found guilty and Khan was handed an indeterminate jail term.