With Molotov cocktails, Corsican flags with the skull and crossbones symbol and the battle cry "Corsica libera" ("Free Corsica"), demonstrators protested against French state authority for the sixth night in a row on the Mediterranean island.
Most recently, the Palais de Justice in Ajaccio, a symbol of French justice, was on fire.
Protesters entered the building and set fire to it.
The facade of a branch of the bank Crédit Agricole was rammed in with an excavator and badly damaged.
Michael Wiegel
Political correspondent based in Paris.
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As in the island's capital, there were violent attacks on the police and gendarmerie during demonstrations in Bastia, Calvi and Korte.
The reason for the ongoing riots is a nearly fatal attack by an Islamist in the Arles prison on the Corsican prefect killer Yvan Colonna on March 2nd.
Colonna, 61, was attacked in a secure facility gym by a fellow inmate deemed dangerous.
A video recording documents how the prisoner, known as an Islamist, who was supposed to clean the fitness room, threw himself on the surprised Colonna and tried to strangle and strangle him with a plastic bag around the neck.
Colonna survived the attack with serious injuries and has been in a coma ever since.
Many young Corsicans at demonstrations
The incident was interpreted in Corsica as a willful failure of the French prison system.
Regional Council President Gilles Simeoni expressed his solidarity with the Colonnas family and called for a full investigation into the incident.
A striking number of young Corsicans also take part in the demonstrations, including many schoolchildren.
The spokesman for the nationalist youth movement Ghjuventù Paolina, Pierre-Francois Filippi, said the assassination attempt on Colonna was the final straw.
"We have been waiting for greater autonomy for six years, but the government simply does not respond," said Filippi.
On the Caribbean island of Guadeloupe, the government was ready to make concessions after violent clashes.
"Is France a democracy that does not react to voting decisions, only to violence," he asked in the Corse Matin newspaper.
In the 2017 regional elections, the alliance of nationalists Gilles Simeoni and Jean-Guy Talamoni won a clear majority of 56.5 percent for the first time.
The alliance has not since called for full detachment from France, but for equal recognition of the Corsican language alongside French and an amnesty for prisoners they consider political prisoners.
The government in Paris has not yielded to either demand.
Presidential candidates interrupt election campaigns
On Friday, however, Prime Minister Jean Castex announced that he would change the prisoner status of the three members of the murder squad to Prefect Claude Erignac as a "sign of pacification".
On the evening of February 6, 1998, the prefect was killed in cold blood with three shots in the back of the head in front of a theater in Ajaccio.
In 2007, the goatherd Colonna was sentenced to life imprisonment by a special jury in Paris.
Colonna had been hiding from the police in the Corsican mountains for years without being recognized.
Two of his convicted comrades-in-arms are also in detention centers on the mainland.
Their families have long been demanding that the prisoners be transferred to a prison in Corsica.
Regional Council President Simeoni said "more political signals" are needed for peace to return to Corsica.
The right-wing presidential candidate Marine Le Pen has canceled a planned campaign rally due to the unrest.
President Emmanuel Macron also refrained from visiting.
According to information from Le Canard Enchainé, he is said to have tried to secure the support of regional council chairman Simeoni with concessions.
But the attack on Colonna put an abrupt end to this endeavor.
Most recently, a ferry with five crew buses and 150 police officers on board had to turn back in the port of Ajaccio because protesting seafarers did not want the security forces to enter the island.