A police officer speaks to forensic investigators outside a property which was raided by police in East Ham, east London, Britain, June 5, 2017.
British police have confirmed another victim in last week's London Bridge terror attack, after they pulled a body out of the Thames River.
Police identified the victim Wednesday as Xavier Thomas, a Frenchman.
Tuesday, London Metropolitan Police identified the third attacker killed by officers during the attack as 22-year-old Youssef Zaghba. They say he was an Italian national of Moroccan descent who lived in East London. He had not been a subject of interest for security officials.
Authorities identified the other two attackers Monday as British citizen Khuram Shazad Butt and Rachid Redouane, who also lived in East London.
A combo handout issued by the Metropolitan Police, June 6, 2017, shows Khuram Shazad Butt (L), Rachid Redouane (C), and Youssef Zaghba who have been named as the suspects in Saturday's attack at London Bridge. (Metropolitan Police via AP)
Police said Butt was previously known to authorities, but had not been viewed as a serious threat because they had no intelligence to suggest the attack was being planned.
Counterterrorism police arrested a 27-year-old man Tuesday in East London, but did not say how he might be connected to the attack.
London Attack, June 3, 2017
1/14Forensic police work within a cordoned off area after an attack in the London Bridge area of London, June 4, 2017.
2/14A police officer carries a bunch of flowers with a message of sympathy near Borough Market after an attack left 7 people dead and dozens injured in London, June 4, 2017.
3/14Police forensic investigators work outside Borough Market after an attack left 7 people dead and dozens injured in London, June 4, 2017.
4/14British police officers walk within a cordoned off area after an attack in the London Bridge area of London, June 4, 2017. Saturday night attackers killed several people in a series of vehicle and knife attacks before police shot them dead.
5/14Police attend to an incident on London Bridge in London, Britain, June 3, 2017.
6/14A police officer clears people away from the area near London Bridge after an incident in central London, June 3, 2017.
7/14Witnesses reported a vehicle veering off the road and hitting several pedestrians on London Bridge, June 3, 2017.
8/14Police attend to an incident on London Bridge in London, Britain, June 3, 2017.
9/14Police say that late Saturday a vehicle mowed down pedestrians on London Bridge and men with large knives stabbing passersby at nearby Borough Market, June 3, 2017.
10/14A photograph taken on a mobile phone shows British police cars blocking the entrance to London Bridge, in central London,June 3, 2017, following an incident on the bridge. Witnesses reported seeing a van mounting the pavement and hitting pedestrians.
11/14People walk away about 10 minutes after midnight from inside a police cordon after an attack in London, June 4, 2017.
12/14People leave from inside a police cordon after an attack in London, June 4, 2017. Armed British police rushed to London Bridge late Saturday after reports of a vehicle running down pedestrians and stabbings nearby.
13/14Women speak to reporters after leaving a police cordon following an incident in London, June 4, 2017.
14/14Armed British police officers walk within a cordoned off area after an attack at the London Bridge, June 4, 2017.
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Police have said Saturday's attack involved three men who were inside a van that struck pedestrians on London Bridge, and then got out and stabbed numerous people at a nearby market area before being shot dead by police.
The Islamic State group claimed responsibility for the attack through its Amaq news agency.
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