Frenchman Xavier Thomas was last seen on London Bridge as the terror attack unfolded
The death toll from the barbaric attack was placed at seven in the immediate aftermath but Frenchman Xavier Thomas has not been seen since the atrocity.
The 45-year-old and his girlfriend Christine Delcros were in London for the weekend and were walking south across London Bridge at around the time the attack began to unfold.
Detectives said witness accounts have led them to believe Mr Thomas might have been knocked into the river after being rammed by the terrorists’ van.
Police and lifeboat crews have been scouring the Thames since the attack
Ms Delcros was seriously injured on the bridge when she was hit by the vehicle and remains in hospital.
Her sister, Nathalie Cros Brohan, posted online that she was on her way to London to visit Christine in hospital.
She appealed for anyone with news of Mr Thomas to get in touch, adding: “We are terribly worried.”
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The more time that passes, the more we fear the worst and our hopes dwindle
Nathalie Cros Brohan
She said: “My sister has tried to remember every instant of the drama. We don’t understand why he hasn’t been found in the hospitals despite the photograph that has been circulated to help identify him. That adds to the worries we have.
“We fear that the collision with the terrorists’ van may have thrown him into the Thames. The more time that passes, the more we fear the worst and our hopes dwindle.”
Both families are being supported by specially-trained family liaison officers in the UK and the French authorities.
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Specialist officers from the Marine Police Unit and the Royal National Lifeboat Institution (RNLI) have been searching the river since the night of the attack.
Emergency services were quickly on the scene London Bridge terror: Scenes as armed police respond Sun, June 4, 2017
At least two people have died after being after reportedly being struck by a van on London Bridge on Saturday night.
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Armed police responding to the incident at London Bridge
But they have now launched an appeal for witnesses.
Anyone was on London Bridge at the time of the attack and has not yet spoken to police, or has seen Mr Thomas since 3 June, is being urged to contact police on 0800 0961 233.
A Scotland Yard spokesman said: “Specially-trained family liaison officers have been deployed to support the families of all those people that police believe died in the attack.
“Families continue to be updated on both the coronial process and the police investigation.
“Formal identification procedures will take place over the coming days. This happens after police have proved to an evidential standard, such as DNA or fingerprints.”