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MADRID, SPAIN - JULY 15: King Felipe of Spain and Queen Letizia of Spain visit the residence of Yves Saint-Geour (L), French ambassador to Spain, to express their condolences for the victims of the terrorist attack in Nice, on July 15, 2016 in Madrid, Spain. A French-Tunisian attacker killed 84 people as he drove a lorry through crowds, gathered to watch a firework display during Bastille Day celebrations. The attacker then opened fire on people in the crowd before being shot dead by police. (Photo by Ballesteros - Pool/Getty Images)

MADRID, SPAIN - JULY 15: King Felipe of Spain and Queen Letizia of Spain visit the residence of Yves Saint-Geour (L), French ambassador to Spain, to express their condolences for the victims of the terrorist attack in Nice, on July 15, 2016 in Madrid, Spain. A French-Tunisian attacker killed 84 people as he drove a lorry through crowds, gathered to watch a firework display during Bastille Day celebrations. The attacker then opened fire on people in the crowd before being shot dead by police. (Photo by Ballesteros - Pool/Getty Images)