Former Peruvian spy chief Vladimir Montesinos has been sentenced to 22 years in prison for "disappearing" a professor and two students in 1993.

Montesinos is already serving long sentences for crimes against humanity and arms trafficking.

But human rights activists said Monday's ruling by a three-judge panel was significant because it was the first time a Peruvian court recognized that the government of former President Alberto Fujimori burned the bodies of some victims during its decade-long crackdown on dissent.

The secret facility where the bodies were burned was in the basement of an army barracks from where Montesinos presided over Peru's intelligence agency.