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People walk near flowers layed at Potters Fields Park in London on June 5, 2017, after a vigil to commemorate the victims of the terror attack on London Bridge and at Borough Market that killed seven people on June 3. London police made a fresh round of arrests on June 5 after the country's third terror attack in less than three months as Prime Minister Theresa May came under mounting pressure over security three days ahead of elections. The aftermath of June 3 night's rampage, which left seven dead and dozens wounded, dominated the campaign trail. / AFP PHOTO / Chris J Ratcliffe (Photo credit should read CHRIS J RATCLIFFE/AFP/Getty Images)

People walk near flowers layed at Potters Fields Park in London on June 5, 2017, after a vigil to commemorate the victims of the terror attack on London Bridge and at Borough Market that killed seven people on June 3.
London police made a fresh round of arrests on June 5 after the country's third terror attack in less than three months as Prime Minister Theresa May came under mounting pressure over security three days ahead of elections. The aftermath of June 3 night's rampage, which left seven dead and dozens wounded, dominated the campaign trail.
 / AFP PHOTO / Chris J Ratcliffe        (Photo credit should read CHRIS J RATCLIFFE/AFP/Getty Images)

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BRADFORD, ENGLAND - JUNE 05: British Prime Minister Theresa May addresses supporters at The Provident Stadium as the Conservative election campaign resumes on June 5, 2017 in Bradford, England. The political parties have resumed campaigning after the weekend's terror attacks in the London Bridge and Borough areas of Central London. Theresa May has been campaigning in London, Scotland and West Yorkshire today. (Photo by Christopher Furlong/Getty Images)

BRADFORD, ENGLAND - JUNE 05:  British Prime Minister Theresa May addresses supporters at The Provident Stadium as the Conservative election campaign resumes on June 5, 2017 in Bradford, England. The political parties have resumed campaigning after the weekend's terror attacks in the London Bridge and Borough areas of Central London. Theresa May has been campaigning in London, Scotland and West Yorkshire today.  (Photo by Christopher Furlong/Getty Images)

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GATESHEAD, UNITED KINGDOM - JUNE 05: Labour Leader Jeremy Corbyn delivers a speech to thousands of gathered crowds at a rally next to the Sage building on June 5, 2017 in Gateshead, United Kingdom. All parties continue to campaign across the country ahead of the general election on June 8. (Photo by Ian Forsyth/Getty Images)

GATESHEAD, UNITED KINGDOM - JUNE 05:  Labour Leader Jeremy Corbyn delivers a speech to thousands of gathered crowds at a rally next to the Sage building on June 5, 2017 in Gateshead, United Kingdom. All parties continue to campaign across the country ahead of the general election on June 8.  (Photo by Ian Forsyth/Getty Images)

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British Prime Minister Theresa May stands behind the counter inside a bakery during an election campaign visit in Fleetwood, north-west England, on June 6, 2017. Britain goes to the polls on June 8 to vote in a general election only days after another terrorist attack on the nation's capital. / AFP PHOTO / POOL / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images)

British Prime Minister Theresa May stands behind the counter inside a bakery during an election campaign visit in Fleetwood, north-west England, on June 6, 2017.
Britain goes to the polls on June 8 to vote in a general election only days after another terrorist attack on the nation's capital. / AFP PHOTO / POOL / BEN STANSALL        (Photo credit should read BEN STANSALL/AFP/Getty Images)

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Supporters hold puppets of Britain's Prime Minister Theresa May (L), Labour leader Jeremy Corbyn (C) and Liberal Democrat leader Tim Farron during a protest to complain about BBC Radio 1's refusal to play Captain SKA's 'Liar Liar' song, near BBC Broadcasting House in London on June 2, 2017. A general election protest song branding British Prime Minister Theresa May a liar reached number four in the charts -- despite the BBC refusing to play it. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

Supporters hold puppets of Britain's Prime Minister Theresa May (L), Labour leader Jeremy Corbyn (C) and Liberal Democrat leader Tim Farron during a protest to complain about BBC Radio 1's refusal to play Captain SKA's 'Liar Liar' song, near BBC Broadcasting House in London on June 2, 2017. 
A general election protest song branding British Prime Minister Theresa May a liar reached number four in the charts -- despite the BBC refusing to play it. / AFP PHOTO / Daniel LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)