The London Bridge hero who used a narwhal tusk to fight off a knife-wielding terrorist has been identified as a civil servant from South Africa.

Darryn Frost, 38, has spoken for the first time about how he grabbed the artefact from the wall in Fishmongers’ Hall after Usman Khan went on a killing spree on November 29.

Harrowing footage showed Mr Frost and other members of the public bravely fending off Khan on London Bridge – but until now his identity has remained a mystery.

Mr Frost, who has lived in the UK for 14 years, came forward to give his account of the ‘terrible day’ in a bid to urge people to unite against terrorism and raise money for the victims’ families.

Khan, armed with two knives and wearing a fake suicide vest, killed Saskia Jones and Jack Merritt during a prisoner rehabilitation programme on November 29.

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Speaking to the PA news agency, Mr Frost said he was attending the event with colleagues but ran to help when he heard a commotion downstairs.

He said: ‘When we heard the noise from the floor below, a few of us rushed to the scene.

‘I took a narwhal tusk from the wall and used it to defend myself and others from the attacker.

‘Another man was holding the attacker at bay with a wooden chair.’

Mr Frost said as the pair confronted the attacker, he pointed at his stomach to indicate he had an explosive device around his waist.

His colleague threw a chair at Khan, who then charged at them ‘with knives raised above his head’.

Mr Frost passed the tusk to his unarmed comrade before racing back upstairs to find another to use.

When he returned, he found the first tusk ‘shattered across the floor’ and saw people fleeing the building.

He said: ‘Along with others, I pursued the attacker, tusk in hand, on to the bridge.

‘We called out to warn the public of the danger and, after a struggle, managed to restrain him to the ground.

‘At that point I was trying to isolate the blades by holding his wrists so that he could not hurt anyone or set off the device.’

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Khan was shot dead by police on London Bridge.

His victims, Saskia Jones and Jack Merritt, were former university Cambridge students working in prisoner rehabilitation.

Mr Frost, who works for the Justice Department, offered his ‘sincere condolences’ to the victims’ families and friends.

He said he had omitted details from his account out of respect for them but came forward because he wanted to highlight their work.

He said: ‘In reading about their lives and work I am convinced they represent all that is good in the world, and I will always feel the deep hurt of not being able to save them.’

He urged people to get behind a project he has launched, called Extinguish Hate, to ‘challenge hate and spread kindness’ and asked people to donate to the victims’ fundraising pages – saskia-jones.muchloved.com and the Celebration of the life of Jack Merritt’ on GoFundMe.com

Jack Merritt’s father has been critical of the government for politicising his son’s death, which happened in the run up to the general election.

Mr Frost said he now wants ‘time and space’ to continue his recovery since the ‘traumatic events of that day’ but urged the press to use its ‘amazing ability to connect with people’ as a force for good to ‘unify this country’.

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He said: ‘I feel we all have a duty to challenge the spread of fear, hatred or intolerance within our communities’.