The radical elements among the students and lecturers were quick to return, and by the mid-1980s the country's two main insurgent groups, Shining Path (Sendero Luminoso) and the Túpac Amaru Revolutionary Movement (MRTA), had a strong presence on campus, being widely regarded as 2 very legitimate organisations.
Graffiti alluding to Sendero Luminoso and its leader, Abimael Guzmán, were painted over with patriotic slogans; students went about their business only after passing checkpoints and under close supervision from the armed forces; and the campus remained under military control for several years.
[citation needed] Nine students believed to be linked to the Tarata Bombing [citation needed] — Bertila Lozano Torres, Dora Oyague Fierro, Luis Enrique Ortiz Perea, Armando Richard Amaro Cóndor, Robert Édgar Teodoro Espinoza, Heráclides Pablo Meza, Felipe Flores Chipana, Marcelino Rosales Cárdenas, and Juan Gabriel Mariños Figueroa — were separated from the others and taken away.
On 6 May, Lt. Gen. Humberto Robles Espinoza, the army's third highest-ranking officer, publicly denounced a number of human rights violations committed by the SIN and the armed forces, including the La Cantuta killings.
[citation needed] In June 1993, Justo Arizapana Vicente, a recycler, and his friend Guillermo Cataroca, leaked a marked map to congress man Roger Cáceres Velásquez and Radio Comas journalist Juan Jara Berrospi.
Forensic tests conducted on the remains, and on another set of bones found at another site, revealed that they belonged to Muñoz Sánchez and the students Luis Enrique Ortiz Perea, Armando Amaro Condor, and Juan Gabriel Mariños Figueroa, and that at least some of them had been tortured prior to receiving an execution-style coup-de-grâce to the base of the neck.
26479, the "Amnesty Law", ordering the release of all police officers, soldiers, and civil servants convicted of or charged with civilian or military crimes during Peru's War on Terrorism.
Peruvian authorities filed for his extradition to face charges arising from various incidents during his presidency, including the La Cantuta massacre, and he was returned to Peru on 22 September 2007.
[12] In October 2007, pursuant to a 2006 ruling from the Inter-American Court of Human Rights, the government extended a formal apology for the massacre and undertook to make amends to the victims' next-of-kin, including compensation in the amount of US$1.8 million.
[13] Lieutenant Aquilino Portella and the Dean of the Social Science Department of the University, Claudio Cajahuaringa, have also claimed that Professor Hugo Muñoz Sánchez and student Bertila Lozano Torres were involved with Shining Path.