BARCELONA, SPAIN - AUGUST 18: People gather and mourn at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: Black ribbon is seen on a shop's window as people gather and mourn at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: People including relatives of the victims gather and mourn at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: King Felipe VI of Spain and Spanish Prime Minister Mariano Rajoy (L) attend a remembrance at Catalonia Square for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: King Felipe VI of Spain and Spanish Prime Minister Mariano Rajoy (L) attend a remembrance at Catalonia Square for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: People gather and mourn at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: People gather and mourn at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: A woman dries her tears as people gather and mourn at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: People gather and mourn at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: People gather and mourn at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: People gather and mourn at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: People gather and mourn at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: People light candles and leave flowers at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: People light candles and leave flowers at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain. ( Burak Akbulut - Anadolu Agency )
BARCELONA, SPAIN - AUGUST 18: People light candles and leave flowers at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: People light candles and leave flowers at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: People light candles and leave flowers at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: Police take security measures as people gather and mourn at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.
BARCELONA, SPAIN - AUGUST 18: Police take security measures as people gather and mourn at La Rambla boulevard for the victims those who lost their lives in terror attack killing at least 13 people when a white van ploughed into a crowd in central Barcelona, on August 18, 2017, Barcelona, Spain.