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Floral tributes and candles are placed by a picture of slain Labour MP Jo Cox at a vigil in Parliament square in London on June 16, 2016. Cox died today after a shock daylight street attack, throwing campaigning for the referendum on Britain's membership of the European Union into disarray just a week before the crucial vote. / AFP / DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

Floral tributes and candles are placed by a picture of slain Labour MP Jo Cox at a vigil in Parliament square in London on June 16, 2016.
Cox died today after a shock daylight street attack, throwing campaigning for the referendum on Britain's membership of the European Union into disarray just a week before the crucial vote.
 / AFP / DANIEL LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)