A Union flag flies at half-mast above the Houses of Parliament in central London on July 16, 2016 in honour and solidarity with the victims of the deadly attack in the southern French city of Nice on July 14.
A gunman smashed a truck into a crowd of revellers celebrating Bastille Day in the French Riviera city of Nice, killing at least 84 people in what President Francois Hollande on Friday called a "terrorist" attack. / AFP / DANIEL LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)