The Cup final, won 3-1 by Napoli at Rome's Olympic Stadium on Saturday, was marred by violent clashes between fans of Napoli and suspected fans of capital club Roma.

Three Napoli fans were taken to hospital with gunshot wounds, one of whom is reported to be in a coma as surgeons decide on how best to extract a bullet which has punctured a lung and lodged near his spinal cord.

A fourth man, believed to be a fan of Roma, was also taken to hospital. He was questioned by police on Saturday night in relation to the incidents prior to kick-off.

Domestic news agency ANSA reported on Sunday that following investigations police had arrested a hardline 'ultra' fan from Roma, Daniele De Santis, and charged him with attempted manslaughter.

He has been accused of launching flares at Napoli fans during clashes in the city prior to the match and then shooting in their direction after they reacted violently.

The report said 48-year-old De Santis is already known to the authorities.

Reports late on Saturday initially said surgeons managed to extract a bullet from the back of one of the fans, a 30-year-old named as Ciro Esposito.

A report Sunday morning in Corriere dello Sport, however, said surgeons had yet to remove the bullet, which was lodged dangerously close to the spinal cord after puncturing a lung, for fear of leaving the fan paralysed.

The report quoted doctors from the San Pietro hospital as saying: "His condition is stable, but critical."

Esposito was expected to be transferred to the city's Gemelli hospital, which is said to contain a specialist neurosurgical unit.

Police also arrested a 33-year-old fan from Napoli and handed him a five-year stadium ban for resisting arrest and injuring a public official.