The arrival in Spain of a group of activists from the Global Sumud Flotilla was overshadowed on Saturday by tense scenes at Bilbao airport, where clashes broke out with the Ertzaintza, the autonomous police force for the Basque Country. The disturbances ended with four people being arrested on charges of serious disobedience, resisting authority and assaulting a police officer. According to police sources, the incidents occurred as six members of the flotilla, who had just landed, were posing for the media and blocked one of the arrivals’ exits at the airport. Officers then intervened, considering that the security cordon had…