But the violence — well known to residents — recently burst onto the national scene with the killings of a prominent businessman and defense lawyer. The government vowed to restore order, and Valls said Friday's arrest was proof those efforts were bearing fruit.
But the wave of bombings is sure to increase the pressure even further and could arouse suspicions that the homegrown nationalist movement is radicalizing again. Twenty years ago, the island was the scene of dozens of bombings, most of them linked to the movement, which has fought for Corsica's distinct language and culture since the island was definitively taken over by the French under Napoleon in 1796.
Saturday marks the anniversary of the adoption of the island's 18th-century constitution and is celebrated by some as the island's national day.