Tens of thousands of people marched through the heart of Barcelona on Saturday in a defiant display of unity against terrorism, joined by Spain's King Felipe VI -- who nonetheless was the target of jeers by Catalan separatists.

Spanish police shoot dead a man they suspect was the Islamist militant who drove a van into a Barcelona crowd last week, killing 13 people.

Drivers plough into pedestrians in two quick-succession, separate attacks in Barcelona and another popular Spanish seaside city, leaving 13 people dead and injuring more than 100 others.