Hundreds of thousands of people in Barcelona have marched against militant Islamists who left 15 people dead in and around the city last week. King Felipe VI led the demonstrators, alongside Prime Minister Mariano Rajoy. The king is the first Spanish sovereign to take part in a demonstration since the monarchy was re-established in the 1970s. <br/><br/>During the march, the king and prime minister walked the streets in front of hundreds of Catalan flags. Prime Minister Rajoy had encouraged everyone to take part to show that Catalonia and the rest of Spain are united against terror.