Police were on Monday questioned 10 nationalists who raised Japanese flags on an island at the heart of a corrosive territorial row, sparking protests in China.
“They showed up at Yaeyama Police Station at 11 a.m. Interviews have started,” an Okinawan police official told AFP by telephone.
The questioning was being done on a voluntary basis and the local police were trying to “get a handle on what happened,” the official said.
The police were examining whether the landing was “appropriate under the law,” he said while declining to give further details.
Japanese media said the 10 could be charged with a minor offense for landing on the island without proper government permission.
Four members of a local assembly in Okinawa, who landed on the island in January and were questioned by the police, were not charged.
On Sunday, members of the right-wing group Gambare Nippon swam ashore from a 20-boat flotilla carrying activists and lawmakers.