Belgian authorities said the suspect arrested on Friday was believed to have supplied the firearm used in the attack.
Spanish police have arrested a man in connection with the 2023 shooting of two football fans in Brussels.
Spanish police and Belgian prosecutors said on Saturday that the suspect was arrested at Malaga Airport the day before.
Two Swedish nationals were killed and another injured in the attack, which took place after a qualifying game between Belgium and Sweden for the Euro 2024 football tournament.
Belgian police shot and killed the gunman.
Belgian authorities said the suspect arrested on Friday was believed to have supplied the firearm used in the attack.
