Incident Summary:

10/28/1986: In a series of seven related attacks carried out jointly by the Macheteros, Organization of Volunteers for the Puerto Rican Revolution, and the Armed Forces of Popular Resistance (FARP), a homemade bomb was discovered at the National Armory in Mayaguez, Puerto Rico. The device failed to explode due to a faulty blasting cap.



United States

North America

region/u.s. state:

Puerto Rico


Attack Information
Type of Attack (more) Bombing/Explosion
Successful Attack? (more) No
Target Information (more)
Target Type: Military
Name of Entity National Armory
Specific Description National Armory, Mayaguez Puerto Rico
Nationality of Target United States
Additional Information
Hostages No
Ransom No
Property Damage No
Weapon Information
Type Sub-type
Explosives/Bombs/Dynamite Other Explosive Type
Weapon Details
homemade bomb
Additional Information
Suicide Attack?No
Part of Multiple Incident?Yes
Criterion 1 (more) Yes
Criterion 2 (more) Yes
Criterion 3 (more) Yes
Additional Information This is part of a multiple attack with 198610280017, 198610280018, 198610280019, 198610280020, 198610280022, and 198610280023. The bomb was discovered around 7:30 AM. The Macheteros, Organization of Volunteers for the Puerto Rican Revolution, and the Armed Forces of Popular Resistance (FARP) jointly released a communiqué taking credit for this attack. Moreover, at 6:45 AM the Macheteros claimed this incident in a phone call to the Associated Press.
Perpetrator Group Information
Group Name Claimed Responsibility
Armed Forces of Popular Resistance (FARP) Yes (Confirmed: Unknown; Mode: Other)
Macheteros Yes (Confirmed: Unknown; Mode: Other)
Organization of Volunteers for the Puerto Rican Revolution Yes (Confirmed: Unknown; Mode: Other)
Perpetrator Statistics
Number of Perpetrators Unknown
Number of Captured Perpetrators Unknown
Casualty Information
Total Number of Casualties 0 Fatalities / 0 Injured
Total Number of Fatalities 0
Number of U.S. Fatalities 0
Number of Perpetrator Fatalities 0
Total Number of Injured 0
Number of U.S. Injured 0
Number of Perpetrators Injured 0
"FBI Analysis of Terrorist Incidents in the United States 1986," Terrorist Research and Analytical Center, Terrorism Section Criminal Investigative Division, FBI, 1986.
Harvey W. Kushner, "Encyclopedia of Terrorism," Sage Publications, 2003.
"Explosions Go Off At Two U.S. Facilities; Bombs Found At Five Sites," Associated Press, October 28, 1986.