Two French citizens were among the seven people killed in the London Bridge attack, the country's foreign ministry said.

A third French national was still missing and four were gravely injured, the statement added.

Le Parisien daily newspaper named the dead man as 36-year-old Sebastian Belanger.

Police said they feared a French tourist, 45-year-old Xavier Thomas, had been thrown into the River Thames by the attackers' van and drowned.

His girlfriend was seriously injured in the collision.

Man covering London Bridge terror attack stops broadcast after man falls into Thames

It comes after a man was arrested on suspicion of terror offences after 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.

Detectives also arrested a 27-year-old man under the Terrorism Act at an address in Barking, east London, shortly after 8am on Tuesday.

Crowds gather for vigil honouring victims of London Bridge attack Show all 8 1 /8 Crowds gather for vigil honouring victims of London Bridge attack Crowds gather for vigil honouring victims of London Bridge attack John Loughrey lays down flowers in Potters Fields Park, central London in honour of the London Bridge terror attack victims PA Crowds gather for vigil honouring victims of London Bridge attack People queue to lay flowers after a vigil for victims of Saturday's attack in London Bridge, at Potter's Field Park in London AP Crowds gather for vigil honouring victims of London Bridge attack Mayor of London, Sadiq Khan (centre) British Home Office Secretary, Amber Rudd (right) and British Shadow Labour Home Secretary (left) Diane Abbott arrive with flowers EPA Crowds gather for vigil honouring victims of London Bridge attack School girls look at flowers at a vigil in Potters Fields Park, central London, in honour of the London Bridge terror attack victims. PRESS ASSOCIATION Photo. Picture date: Monday June 5, 2017. See PA story POLICE Bridge. Photo credit should read: Nick Ansell/PA Wire PA Crowds gather for vigil honouring victims of London Bridge attack Floral tributes left for victims of Saturday’s London Bridge attack AP Crowds gather for vigil honouring victims of London Bridge attack People pay their respects, leaving floral tributes after a vigil for victims of Saturday’s attack in London Bridge AP Crowds gather for vigil honouring victims of London Bridge attack People queue to honour those killed on Saturday. Police have arrested several people and are widening their investigation after the attack AP Crowds gather for vigil honouring victims of London Bridge attack Tributes lie outside City Hall in London EPA

On Tuesday the third attacker was named as Youssef Zaghba, an Italian national of Moroccan descent, who was living in east London.

Zaghba, Pakistan-born British citizen Khuram Butt, 27, and Rachid Redouane, 30, who claimed to be Moroccan-Libyan, launched a murderous rampage around London Bridge and Borough Market on Saturday night.

Police shot and killed the three perpetrators within eight minutes of the alarm being raised, but 48 people had already been injured.