A man has been arrested on suspicion of terror offences by detectives investigating the London Bridge attack following an early morning raid at an address in east London.
The 30-year-old was held on suspicion of the commission, preparation or instigation of terrorist acts during a search of a property in Ilford and taken for questioning at a south London police station, Scotland Yard said.
Eight people are confirmed to have been killed in the attack on Saturday night, which was carried out by three men.
Police searching for missing French national Xavier Thomas recovered a body from the River Thames.
It is believed he was struck by the terrorist's van on London Bridge and a witness reported seeing him being thrown into the water.
French President Emmanuel Macron confirmed that a third citizen died in the attack.
"We received confirmation of the new toll this morning. There are three deaths and eight injuries on the French side," Mr Macron said, deploring the "heavy toll these attacks have taken on us".
Today's arrest comes as security services face growing questions over their monitoring of the three attackers in the lead up to the attack.
A Metropolitan Police spokesman said: "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 June 7.
"Officers from the Met's Counter Terrorism Command, supported by officers from the Territorial Support Group, entered the address in Ilford at around 1.30am.
"A 30-year-old man was arrested on suspicion of the commission, preparation or instigation of terrorist acts (contrary to section 5 Terrorism Act 2006) and has been taken into custody at a south London police station under the Terrorism Act 2000.
"A search of the address is ongoing."
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Two men were arrested in Ireland yesterday in connection with one of the attackers, Rachid Redouane, who lived in the Rathmines area of Dublin for a period in 2012.
The arrests were made in Limerick and Wexford. Gardaí say further arrests are expected in connection with the incident.
In total 15 men have arrested as part of the investigation, with 12 of those released without charge.
Separately, police this evening said they had carried out a controlled explosion near where the United States is building a new embassy in southwest London.
However, the unattended vehicles which triggered the action turned out not to be suspicious.
