Puerto Rican police shoot two nationalists in the Cerro Maravilla murders.

Puerto Rico, officially the Commonwealth of Puerto Rico, is a self-governing Caribbean archipelago and island organized as an unincorporated territory of the United States under the designation of commonwealth. Located about 1,000 miles (1,600 km) southeast of Miami, Florida, between the Dominican Republic in the Greater Antilles and the U.S. Virgin Islands in the Lesser Antilles, it consists of the eponymous main island and numerous smaller islands, including Vieques, Culebra, and Mona. With approximately 3.2 million residents, it is divided into 78 municipalities, of which the most populous is the capital municipality of San Juan, followed by those within the San Juan metropolitan area. Spanish and English are the official languages of the government, though Spanish predominates.

The Cerro Maravilla murders, also known as the Cerro Maravilla massacre, occurred on July 25, 1978, at Cerro Maravilla, a mountain in Ponce, Puerto Rico, wherein two young Puerto Rican pro-independence activists, Carlos Enrique Soto Arriví and Arnaldo Darío Rosado Torres, were murdered in a Puerto Rico Police ambush after being entrapped. The event sparked a series of political controversies where, in the end, the police officers were found guilty of murder and several high-ranking local government officials were accused of planning and/or covering up the incident.