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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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Members of the publice stand beyond a cordon as police officers stand on duty outside a row of shop, with residential flats above, in East Ham in east London on June 4, 2017, following a raid as police continue their investigations following the June 3 terror attacks in central London. British Prime Minister Theresa May blamed 'evil' Islamist ideology Sunday for an attack by knife-wielding men who mowed down and stabbed revellers in London, killing seven, as police said they had arrested 12 suspects. / AFP PHOTO / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

Members of the publice stand beyond a cordon as police officers stand on duty outside a row of shop, with residential flats above, in East Ham in east London on June 4, 2017, following a raid as police continue their investigations following the June 3 terror attacks in central London.
British Prime Minister Theresa May blamed 'evil' Islamist ideology Sunday for an attack by knife-wielding men who mowed down and stabbed revellers in London, killing seven, as police said they had arrested 12 suspects. / AFP PHOTO / Justin TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

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LONDON, ENGLAND - JUNE 04: Members of the public view the scene after police officers raided a property in East Ham on June 4, 2017 in London, England. Police have arrested 12 people after raids in Barking following last night's terrorist attacks on London Bridge and at Borough Market where 7 people were killed and at least 48 injured. Three attackers were shot dead by armed police at the scene. (Photo by Carl Court/Getty Images)

LONDON, ENGLAND - JUNE 04:  Members of the public view the scene after police officers raided a property in East Ham on June 4, 2017 in London, England. Police have arrested 12 people after raids in Barking following last night's terrorist attacks on London Bridge and at Borough Market where 7 people were killed and at least 48 injured. Three attackers were shot dead by armed police at the scene.  (Photo by Carl Court/Getty Images)

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LONDON, UNITED KINGDOM - JUNE 04: Police officers inspect houses during an operation at the Barking neighborhood following the terror attack at London Bridge and Borough Market, in London, England on June 04, 2017. At least six people were killed in attacks late Saturday as a van mowed down pedestrians on London Bridge before attackers then stabbed victims at nearby Borough Market. (Photo by Behlul Cetinkaya/Anadolu Agency/Getty Images)

LONDON, UNITED KINGDOM - JUNE 04: Police officers inspect houses during an operation at the Barking neighborhood following the terror attack at London Bridge and Borough Market, in London, England on June 04, 2017. At least six people were killed in attacks late Saturday as a van mowed down pedestrians on London Bridge before attackers then stabbed victims at nearby Borough Market.
 (Photo by Behlul Cetinkaya/Anadolu Agency/Getty Images)

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LONDON, ENGLAND - JUNE 04: Police officers outside a property in East Ham which has been raided by police on June 4, 2017 in London, England. Police have arrested 12 people after raids in Barking following last night's terrorist attacks on London Bridge and at Borough Market where 7 people were killed and at least 48 injured. Three attackers were shot dead by armed police at the scene. (Photo by Carl Court/Getty Images)

LONDON, ENGLAND - JUNE 04:  Police officers outside a property in East Ham which has been raided by police on June 4, 2017 in London, England. Police have arrested 12 people after raids in Barking following last night's terrorist attacks on London Bridge and at Borough Market where 7 people were killed and at least 48 injured. Three attackers were shot dead by armed police at the scene.  (Photo by Carl Court/Getty Images)