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+---
+title: Peteano bombing
+aliases:
+  - Peteano bombing
+  - Peteano massacre
+  - Strage di Peteano
+created: 2026-05-17
+updated: 2026-05-17
+category: "Terrorism Event"
+tags:
+  - Event
+  - Italy
+  - Terrorism
+  - StrategyOfTension
+  - Gladio
+  - Neofascism
+  - 1970s
+summary: "The Peteano bombing of May 31, 1972, in which three Carabinieri were killed by a booby-trapped Fiat 500 near Gorizia, was carried out by Ordine Nuovo member Vincenzo Vinciguerra, whose subsequent confessions in 1984 directly implicated the Italian stay-behind network and led magistrate Felice Casson to uncover the Gladio documents that forced Andreotti's 1990 parliamentary disclosure."
+start: 1972-05-31
+location: "Peteano, Friuli, Italy"
+---
+
+The Peteano bombing occurred on May 31, 1972, near the village of Peteano in the Friuli region of northeastern [[Italy]]. Three Carabinieri (military police) officers were killed and two injured when a booby-trap bomb exploded as they investigated an abandoned Fiat 500 that had been left on a road with a note claiming it had been used in a crime. The attack was part of the [[Operation Gladio|strategy of tension]] and proved foundational to the eventual exposure of the [[Operation Gladio|Gladio]] stay-behind network eighteen years later.[^1]
+
+### The Attack
+
+The three Carabinieri who died - Donato Poveromo, Franco Dongiovanni, and Silvio Bellini - responded to a report of the abandoned vehicle. When they opened the hood of the Fiat 500, they triggered a charge packed into the engine compartment. The bomb used C4 plastic explosive - a military-grade material that was not commercially available in Italy, a detail that investigators initially suppressed.
+
+Initial investigation blamed the [[Brigate Rosse|Red Brigades]], then a new organization operating in northern Italy. No charges were brought for years. [[SISMI|SID]] (Italian military intelligence) was later found to have provided false forensic evidence in the initial investigation, misidentifying the explosive used as a different material consistent with civilian manufacture, in order to prevent the military-grade identification from pointing toward the stay-behind network's weapons caches.[^1]
+
+### Vincenzo Vinciguerra's Confession
+
+In 1979, Vincenzo Vinciguerra, a member of [[Ordine Nuovo]] who had fled to Spain after the attack, surrendered voluntarily to Italian authorities in 1979. In 1984, facing a life sentence, he made a voluntary confession to the Peteano bombing and provided detailed testimony about the network that had organized and protected the attack.
+
+Vinciguerra's testimony was explicit: the attack had been carried out with the knowledge of elements of SID, weapons from the Gladio stay-behind network's caches, and with the expectation of intelligence service protection from prosecution. He described a structure in which neofascist operatives provided deniable capacity for attacks that served the strategy of tension's political objectives of creating fear and justifying authoritarian responses.
+
+Vinciguerra was convicted and received a life sentence. He subsequently continued providing testimony and statements that constituted the most detailed first-person account of how the strategy of tension network functioned operationally.[^1]
+
+### Felice Casson and the Gladio Documents
+
+The Peteano case was reopened in 1984 by [[Felice Casson]], a young Venice investigating magistrate. Pursuing the explosive identification discrepancy and Vinciguerra's testimony, Casson obtained access to SID/[[SISMI]] records. In 1990, Casson discovered documents in SISMI's archives that directly referenced the Gladio stay-behind network and its arms caches.
+
+Casson requested authorization from the government to access further classified Gladio materials. Prime Minister [[Giulio Andreotti]], faced with the disclosure request, chose to acknowledge the network's existence to Parliament on October 24, 1990. The Peteano bombing - a single attack in a remote Friulian village in 1972 - thus became the direct chain of evidence that forced the exposure of the entire NATO stay-behind infrastructure eighteen years after it occurred.[^2]
+
+### Significance
+
+The Peteano case demonstrates the structural mechanism of the strategy of tension: a neofascist operational cell commits an attack; military intelligence suppresses forensic evidence pointing toward the weapons network; the attack is misattributed to the left; and the political climate shifts toward the security measures the strategy intended. That the entire apparatus was ultimately exposed through a single magistrate pursuing a single anomaly in a single case is equally illustrative of how the strategy of tension came undone.[^1]
+
+### Footnotes
+
+[^1]: Ganser, Daniele. *NATO's Secret Armies: Operation GLADIO and Terrorism in Western Europe.* Frank Cass, 2005, Chapter 4. Willan, Philip. *Puppetmasters: The Political Use of Terrorism in Italy.* Constable, 1991.
+[^2]: Italian Senate Commissione Stragi. *Final Report.* Rome, 2001. Flamini, Gianni. *Il Partito del Golpe.* Bovolenta, 1982-1985.