A woman is comforted by her friend as she breaks down in tears during a minutes silence near the scene of Saturday's terrorist attack, June 6, 2017, in London. Carl Court/Getty Images

Members of the public observe a minute's silence for the victims of the London Bridge terror attacks on London Bridge, June 6, 2017. Facundo Arrizabalaga/EPA

A vigil is held for the victims of the London Bridge terror attack in Potters Fields Park, June 5, 2017, in London. James Gourley/REX/Shutterstock

People bow their heads along with London Mayor Sadiq Khan during a vigil at Potters Fields Park in London, June 5, 2017, to commemorate the victims of the terror attack on London Bridge. Odd Andersen/AFP/Getty Images

Police forensic officers work on the London Bridge, June 4, 2017, as police continue their investigations following the June 3 terror attack in London. Daniel Leal-Olivas/AFP/Getty Images

Members of the public view the scene after police officers raided a property in East Ham, June 4, 2017 in London, following the attack on the London Bridge. Carl Court/Getty Images

Forensic investigators work near Borough Market in London on June 4, 2017, following the June 3 terror attack on the London Bridge. Niklas Halle'n/AFP/Getty Images

People receive medical attention on Thrale Street near London Bridge following a terrorist incident, June 3, 2017. Federica De Caria/Press Association via AP

Armed police officers respond to an incident on London Bridge in London, Saturday night, June 3, 2017. Dominic Lipinski/PA via AP

People leave the area with their hands up after an incident near London Bridge in London, June 4, 2017. Neil Hall/Reuters

Armed police stand over two suspects shot at the scene of a terror attack outside Borough Market in central London, June 3, 2017. Gabriele Sciotto/AFP/Getty Images

A victim is treated near London Bridge after a vehicle struck pedestrians in an apparant attack, June 3, 2017 in London. Ben Cawthra/REX/Shutterstock

Police and members of the emergency services attend to victims after an attack on the London Bridge in central London, June 3, 2017. Daniel Sorabji/AFP/Getty Images

People flee the area near London Bridge after reports of an incident involving a vehicle and pedestrians, June 3, 2017 in London. Ben Cawthra/REX/Shutterstock