MADRID, SPAIN - MARCH 23: King Felipe and Queen Letizia of Spain visit the Belgium Embassy to sign the book of condolences after terrorist attacks on March 23, 2016 in Madrid, Spain. (Photo by Europa Press/Europa Press via Getty Images)
MADRID, SPAIN - MARCH 23: King Felipe and Queen Letizia of Spain visit the Belgium Embassy to sign the book of condolences after terrorist attacks on March 23, 2016 in Madrid, Spain. (Photo by Europa Press/Europa Press via Getty Images)