• The police in Spain were still hunting for a 22-year-old Moroccan-born man who is suspected of driving the van that ran down pedestrians in Barcelona, killing 13. A 14th person died in an attack hours later in the town of Cambrils.

Even as the country mourns, the Spanish authorities are trying to answer how a group that included teenagers was able to carry out such a well-planned attack in a country that had long parried danger, despite being a tempting and symbolic target for Islamists.