Four members of an Indonesian military intelligence unit received prison sentences on Wednesday. They were convicted for an acid attack on rights advocate Andrie Yunus. Human rights activists expressed concerns, calling the proceedings a “blatant whitewash.”

The case was reviewed by a military court, though activists argued it should have been handled by civilian judges. The sentences ranged from 18 months to three years. However, the defendants faced a maximum of 12 years for the March attack.

Usman Hamid, executive director of Amnesty International Indonesia, commented on the verdict. He said it aims to protect the military’s institutional integrity. It also shields potential higher-ups involved in the incident from scrutiny.

The verdict protects the institutional integrity of the military and shields the full chain of command and other actors potentially linked to this incident from scrutiny,

Hamid described the trial as failing to deliver justice or truth for Andrie Yunus.

Andrie, 27, serves as deputy coordinator of the rights group Kontras. An assailant threw acid on him while he was riding his motorbike in Jakarta, causing burns to 24 percent of his body and damaging his right eye.

Despite multiple surgeries to save his eye, Andrie remains hospitalized. He objected to the involvement of military prosecutors in April, refused to testify, and opposed the move to a military court.