The Cerro Maravilla murders Killing , also known as the Cerro Maravilla massacre , occurred Coming_to_be on July 25 , 1978 , at Cerro Maravilla , a mountain in Puerto Rico , wherein two young Puerto Rican pro-independence activists , Carlos Enrique Soto-Arriví ( 1959-1978 ) and Arnaldo Darío Rosado-Torres ( 1953-1978 ) , were murdered Killing in a Puerto Rico Police ambush Attack .