The letter was announced on 8th October.
In the letter, the teacher namely Daw Nu Nu Hlaing is alleged informing the military about CDM teachers; forcing them to re-enter into the working environment; and telling the students that NUG/PDF are the terrorists.
The PDF said in the letter that the teacher Daw Nu Nu Hlaing will be taken action if continuing such acts.
Within three years, at least 68 schoolteachers of both genders have been killed and many were threatened.
In addition, a total of more than 120 schools were torched and more than 530 schools were attacked.