River Plate hooligans described as the “mafia of Argentine soccer” were behind the attack on Boca Juniors’ bus before the Copa Libertadores final second leg, says the mayor of Buenos Aires.

Saturday’s game delayed by 24 hours then postponed, with its rescheduling set to be discussed on Tuesday.

Several Boca players were injured when the windows on the bus were broken on the way to River’s Estadio Monumental.

Buenos Aires mayor Horacio Rodriguez Larreta said it was a revenge attack.

He said the incident occurred a day after police raided the house of a leader of the Barra Brava – the powerful and violent wing of River’s hardcore support.

They confiscated 10 millions pesos (£207,285) and 300 tickets for the final.

“The problem is the Barra Brava – a mafia who have been embedded in football for more than 50 years,” he added.

“They are responsible for these incidents. This is directly related to the episode the day before. So 300 people were not allowed in and they were the principle protagonists of everything that happened.”

South American football expert Tim Vickery says the Barra Brava makes their money through nefarious activities, including selling tickets on the black market.