Security authorities on Wednesday evacuated a cathedral in northeastern Spain which is one of the country\'s most popular religious and tourist attractions, after a device exploded inside the cathedral, causing some damage but no injuries. The explosion took place at around 13:45 local time at the Basilica of Our Lady of the Pilar in the city of Zaragoza. An previously unknown anarchist group named \"Comando Insurreccionalista Mateo Moral\" has claimed responsibility for the incident. The explosion occurred just three days before the city\'s yearly Pilar festival, which attracts tens of thousands of people.