The prosecutor says 18-year-old Odai Abu-Issa torched King Abdallah II’s poster in front of a government office in southwestern Jordan two weeks ago.

The motive remains unclear. Abu-Issa belongs to a small group of young Jordanians who have been demanding Abdallah’s absolute powers be curbed.

The prosecutor said the verdict by the military State Security Court was issued Thursday. He insisted on anonymity in line with military regulations.

Abu-Issa’s lawyer, Moussa Al-Abdallat, says the sentence is “harsh” and that he will appeal.