Two men are being held as suspects over the death of a Deportivo La Coruna supporter before a La Liga clash last month, police said.
Francisco Javier Romero, 43, died in apparent organised fighting between Atletico Madrid and Deportivo ultra fans on November 30.
“32 ultras have been detained in Madrid, Avila and Toledo over the violent incidents in Manzanares, and among them are the two suspected culprits of the murder,” police said on their Twitter feed.
Since the death Spanish authorities and football’s ruling bodies in the country have been looking at ways to eradicate fan violence.
Two PSG were also stabbed outside the Nou Camp following Barcelona’s victory over the French side last Wednesday.
“It is not just enough to control the ultra groups, they need to be kicked out of football,” Javier Tebas, president of Spain’s football league (LFP) told reporters last week.