CHILLING footage has emerged showing London Bridge the terror ringleader in a superman hoodie threatening an ex-Muslim months before the Borough Market attack.

Khuram Butt can be seen smiling as he confronts the man in the chilling clip, telling him he “should be killed”.

4 Khuram Butt can be seen telling a former Muslim he should be killed Credit: BBC

4 Butt was the ringleader of the London Bridge terror attack Credit: PA:Press Association

The man, from North West London, told the BBC: “He came up and said, ‘I want to have a discussion’.

“He turned suddenly and got personal and started threatening that I'm going to kill you.

“He was just threatening and very aggressive. I was scared – he said, ‘If you do not honour my religion you should be killed’.

“I knew it, this guy was going to do something stupid and he did.

“I just regret. Why didn't I inform this to the police? Because if I did I could have saved many lives.

“Maybe the police would have listened.”

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The shocking altercation is believed to have been filmed in August last year – nine months before Butt and his accomplices went on their bloody rampage.

After ploughing a white van into several pedestrians on London Bridge, the killers ran down a flight of stairs at the side of the bridge towards Cafe Brood near Borough Market.

The terrorists then ran down the road and began to attack drinkers in the nearby Mudlark pub before entering Borough Market itself.

4 Terrified members of the public flee during the brutal killing spree Credit: AP:Associated Press

4 Cops load the London Bridge terrorists' hired van onto a low loader Credit: Chris Eades - The Sun

All three men were gunned down by cops some eight minutes after launching their attack.

Police identified two of the sick attackers as Pakistani-born Butt, 27, and Morrocan Rachid Redoune, 30.

The third attacker, also Morrocan-born, was Youssef Zaghba.

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