A man sleeps as another one stands by an impromptu memorial where a van crashed into pedestrians at Las Ramblas in Barcelona, Spain, August 20, 2017 Reuters

People attend a mass to commemorate victims of two devastating terror attacks in Barcelona and Cambrils, at the Sagrada Familia church in Barcelona on August 20, 2017 AFP

People gather at an impromptu memorial where a van crashed into pedestrians at Las Ramblas, in Barcelona, Spain, August 20, 2017 Reuters

People gather at an impromptu memorial where a van crashed into pedestrians at Las Ramblas, in Barcelona, Spain, August 20, 2017 Reuters

People gather at an impromptu memorial where a van crashed into pedestrians at Las Ramblas, in Barcelona, Spain, August 20, 2017 Reuters

A man sleeps by an impromptu memorial where a van crashed into pedestrians at Las Ramblas, in Barcelona, Spain, August 20, 2017 Reuters

A man stands by an impromptu memorial where a van crashed into pedestrians at Las Ramblas, in Barcelona, Spain, August 20, 2017 Reuters

A man stands by an impromptu memorial where a van crashed into pedestrians at Las Ramblas in Barcelona, Spain, August 20, 2017 Reuters

People gather at an impromptu memorial where a van crashed into pedestrians at Las Ramblas in Barcelona, Spain, August 20, 2017 Reuters

People react at an impromptu memorial where a van crashed into pedestrians at Las Ramblas in Barcelona, Spain, August 20, 2017 Reuters

A woman reacts at an impromptu memorial where a van crashed into pedestrians at Las Ramblas in Barcelona, Spain, August 20, 2017 Reuters