According to 'Carrusel Deportivo' on Cadena SER, five members of the Barcelona supporting ultras group the Boixos Nois were arrested on Saturday after an altercation close to the Vicente Calderon in Madrid,
The reports say the say an incident took place a supermarket and there was a lot of damage left at the scene where they were detained.
Sources from the Government Delegation in Madrid have indicated that thirteen other radicals have been identified as being involved in the incident.
In addition to this incident, witnesses have told EFE that various Barcelona fans attacked Alaves supporters in the La Latina area of the Spanish capital in the build up to the Copa del Rey final in the city.
According to the witnesses, at around 17.30, 20 radical supporters encountered a group of the Basque club's fans and attacked them.
Several witnesses, fans of Barcelona, rushed to help the fans of Deportivo Alaves, while was when the the radicals decided to flee.