Giampietri was one of the naval officers implicated in the massacre on El Frontón , a prison island off the coast of Callao . The massacre took place during Alan García 's administration , on June 18 , 1986 , after Shining Path prisoners staged an uprising at El Frontón and two other prisons . All the prisoners involved in the rebellion were killed , and Human Rights Watch claimed that evidence suggested that " no fewer than ninety " of the prisoners killed were victims of extrajudicial executions
the massacre
Peruvian prison massacres
Luis Giampietri