Khmer Rouge tribunal authorities took jailed leader Ieng Sary for a routine medical examination Monday, to check on his hypertension and other ailments, officials said.

Ieng Sary suffers from heart problems, but doctors at Calmette Hospital would not disclose the findings of Monday’s check-up.

Tribunal spokesman Reach Sambath said Tuesday the courts had a “duty” to ensure Ieng Sary, who is 82 and charged with war crimes and crimes against humanity, was healthy and can face trial.

Hisham Moussar, who monitors the tribunal for the rights group Adhoc, said Tuesday that the fear remains that the accused leaders will die before seeing trial.