According to the RMC broadcaster, demonstrations in support of Colonna turned into clashes with the police, leaving at least 14 people injured in the city of Ajaccio. Two people have been put in custody in the same city.
Another 26 people were injured in the city of Bastia, including 23 police officers, the report read.
Colonna is convicted for the 1998 assassination of then-French prefect in Corsica Claude Erignac and is serving his sentence in a French prison. In early March, he was beaten by another prisoner and hospitalized in critical condition, and has been in a coma ever since.