British police confirmed on Wednesday that the death toll from Saturday's attack on London Bridge had risen to eight.
Earlier, police, who were hunting for Frenchman Xavier Thomas, missing since the attack, said that they had found a body in the River Thames.
Ten people remain in a critical condition after Islamist militants targeted pedestrians and revellers in London at the weekend, the English health authority said on Wednesday.
British police arrested a man under counter terrorism laws on Wednesday as part of an investigation into the London Bridge attack.
“Detectives investigating the London Bridge terror attack have carried out a search warrant at an address in east London in the early hours of Wednesday,” police said in as statement.
"A 30-year-old man was arrested on suspicion of the commission, preparation or instigation of terrorist acts," police said.
At least seven people were killed and dozens wounded on Saturday when three men rammed a van into pedestrians on London Bridge and then went on the rampage through the bustling Borough Market area where they slit throats and stabbed people. The three attackers were shot dead at the scene by police.
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