After armed officers opened fire on the three terrorists on Saturday night to end their devastating rampage in Borough Market, police confirmed that one man had been accidentally shot.
Now, an eyewitness who works in the Wheatsheaf pub in Borough Market has claimed the wounded man was a US citizen.
One of the attackers was also shot dead outside the Wheatsheaf pub (pictured)
Fabio Lamas, 20, said he urged crowds to move away from the area after spotting the knifemen an hearing someone shout ‘knives, knives knives’.
He told NBC News: “I got people to start evacuating inside from our little garden that we have… and got people to come into the bar and to go into toilets, hide under tables and hide in our cellar where we keep all our stock.
“Then I heard shooting and I saw an American guy get shot in the head.”
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Mr Lamas claimed the victim, whose name has not yet been revealed, was near a window of the Wheatsheaf pub when he was hit. One of the attackers was also shot dead outside the pub.
The barman said the victim was with two friends, who identified themselves as American doctors currently living in London.
Mr Lamas added: “He was bleeding through his eye.
“I went to get the first-aid kit and I started speaking to his friends and to try and calm them down.”
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Tributes have appeared across London in honour of those killed in Saturday's attack
Metropolitan Police assistant commissioner Mark Rowley confirmed that a male civilian had been accidentally shot, but refused to give any further details.
The injuries sustained by the bystander are being investigated by the Independent Police Complaints Commission.
Malik Ramadhan, a Royal London Hospital doctor, told the Guardian that a member of the public had been shot in the head but that he is “absolutely not dying”, and is expected to make a full recovery.
Thousands came out to honour the victims of Saturday night's attack on Monday evening
Saturday night’s devastating attack claimed the lives of seven people and left dozens more injured in the third terror attack on British soil in less than three months.
On Sunday evening, Christine Archibald became the first named victim of the attack.
The Canadian national died in her fiancé’s arms.
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Cassie Ferguson Rowe said her brother, Tyler Ferguson, held Ms Archibald and she died in his arms.
Writing on Facebook, she said: "Last night in London my baby brother lost the love of his life on the London Bridge.
"In a split second his entire life was ripped away from him. Hearing his painful sobs on the phone while he's alone trying to deal with this tears me apart.
"I have no words. If you know Tyler, please be there for him now, and later when what happened sinks in, he's going to need us all."