Col Winthai Suvaree said the movement of some northern activists under the name “Sor Por Por Lanna” could be destructive and against the law.
He said the Third Army Region commander was instructed to look into the group’s activities, calling on people to be extra cautious in organising their political activities.
They can exercise their constitutional right in holding demonstrations but an announcement to separate the kingdom is against the law, he said.
Col Winthai said the army would also take harsh legal action against Red Shirt activist Wutthipong Kachathamkul, alias Ko Tee, for publicly threatening to arrest the commanders of the Royal Guards First Division and the Royal Guards 11th Infantry Department.
Ko Tee’s statement in a radio broadcast was an intimidation against state officials, he said, adding that police would be asked to speed up investigation in the case.