The mass grave was one of several tunnels built for a hydro-electric power plant and it is assumed to contain the remains of at least 40 Muslims killed at the start of the war in Bosnia, said local media.
The authorities of the Federation, Bosnia's Croat-Muslim entity, were tipped about the mass grave by Serbs living in the Foca area.
Gojko Jankovic and Dragan Zelenovic, who were indicted by the Hague war crimes tribunal, are believed to be responsible for crimes committed in said area.