Guerrilla Army of the Poor
In 2014, Yates reported that an investigation confirmed a significant mistake in the documentary, which had blamed the army for a village massacre that had actually been carried out by the Guerrilla Army of the Poor (EGP). She stated: "We intend to make a correction that will clarify what happened in this scene in both "When the Mountains Tremble" and "Granito". The filmmakers thought they had filmed the aftermath of an army massacre in Chajul, but it was actually a different incident in Batzul, where guerrillas had executed 17 members of a village patrol organized by the army.