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LONDON, ENGLAND - JUNE 04: Britain's Prime Minister Theresa May addresses the media as she makes a statement, following a COBRA meeting in response to last night's London terror attack, at 10 Downing Street on June 4, 2017 in London, England. Prime Minister Theresa May has left the election campaign trail to hold a meeting of the emergency response committee, Cobra, this morning following a terror attack in central London on Saturday night. 7 people were killed and at least 48 injured in terror attacks on London Bridge and Borough Market. Three attackers were shot dead by armed police. (Photo by Leon Neal/Getty Images)

LONDON, ENGLAND - JUNE 04:  Britain's Prime Minister Theresa May addresses the media as she makes a statement, following a COBRA meeting in response to last night's London terror attack, at 10 Downing Street on June 4, 2017 in London, England. Prime Minister Theresa May has left the election campaign trail to hold a meeting of the emergency response committee, Cobra, this morning following a terror attack in central London on Saturday night. 7 people were killed and at least 48 injured in terror attacks on London Bridge and Borough Market. Three attackers were shot dead by armed police.  (Photo by Leon Neal/Getty Images)

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Police forensic officers work on London Bridge in London on June 4, 2017, as police continue their investigations following the June 3 terror attack. Seven people were killed in a terror attack on Saturday by three assailants on London Bridge and in the bustling Borough Market nightlife district, the chief of London's police force said on Sunday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

Police forensic officers work on London Bridge in London on June 4, 2017, as police continue their investigations following the June 3 terror attack.
Seven people were killed in a terror attack on Saturday by three assailants on London Bridge and in the bustling Borough Market nightlife district, the chief of London's police force said on Sunday. / AFP PHOTO / Daniel LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

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LONDON, ENGLAND - JUNE 04: Forensic officers enter Borough Market near the scene of last night's terrorist attack on June 4, 2017 in London, England. Police continue to cordon off an area after responding to terrorist attacks on London Bridge and Borough Market where 7 people were killed and at least 48 injured last night. Three attackers were shot dead by armed police. (Photo by Christopher Furlong/Getty Images)

LONDON, ENGLAND - JUNE 04: Forensic officers enter Borough Market near the scene of last night's terrorist attack on June 4, 2017 in London, England. Police continue to cordon off an area after responding to terrorist attacks on London Bridge and Borough Market where 7 people were killed and at least 48 injured last night. Three attackers were shot dead by armed police.  (Photo by Christopher Furlong/Getty Images)

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LONDON, ENGLAND - JUNE 04: Armed police officers stand guard at the perimeter cordon, following last night's London terror attack, on June 4, 2017 in London, England. Prime Minister Theresa May has left the election campaign trail to hold a meeting of the emergency response committee, Cobra, this morning following a terror attack in central London on Saturday night. 7 people were killed and at least 48 injured in terror attacks on London Bridge and Borough Market. Three attackers were shot dead by armed police. (Photo by Leon Neal/Getty Images)

LONDON, ENGLAND - JUNE 04:  Armed police officers stand guard at the perimeter cordon, following last night's London terror attack, on June 4, 2017 in London, England. Prime Minister Theresa May has left the election campaign trail to hold a meeting of the emergency response committee, Cobra, this morning following a terror attack in central London on Saturday night. 7 people were killed and at least 48 injured in terror attacks on London Bridge and Borough Market. Three attackers were shot dead by armed police.  (Photo by Leon Neal/Getty Images)

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The aftermath of the London Bridge terror attack is seen in London on June 4, 2017. Police forensics officers work on London Bridge. Seven people have been killed in central London after three men drove a van into pedestrians on London Bridge, before launching a knife attack on people around Borough Market. Flowers have also been put near the bridge to commemorate the victims. (Photo by Alberto Pezzali/NurPhoto via Getty Images)

The aftermath of the London Bridge terror attack is seen in London on June 4, 2017. Police forensics officers work on London Bridge. Seven people have been killed in central London after three men drove a van into pedestrians on London Bridge, before launching a knife attack on people around Borough Market. Flowers have also been put near the bridge to commemorate the victims.  (Photo by Alberto Pezzali/NurPhoto via Getty Images)