The investigation into the arrest related to the letter bomb case continues. Authorities are pursuing a package that passed through the Correos Postal Treatment Center in Valladolid. The search extends beyond Valladolid to León and several regions in Galicia. In these six provinces, four in Galicia and two in Castile-Leon, investigators are concentrating their efforts as details emerge from official briefings and ongoing reporting.
A package traveling from Valladolid to Madrid went through a post office scanner without triggering alerts, according to recovered images. Like the others, it bore a seal featuring the Santa Trega fortress image associated with A Guardia Council and the Pontevedra province. Experts confirm that Correos placed it into circulation on April 21.
View 35,000 stamps
Data from Correos shows the stamp used on these parcels belongs to a series called Nature. About 135,000 copies exist, circulating not only in Galicia but also available for purchase across Spain. The stamps are priced at 2.70 euros and can be bought anywhere in the country.
Investigations have refined the focus to roughly 35,000 stamps bearing that image, distributed across Galicia, León, and Valladolid—areas linked to the earliest traceable arrival points of the explosive consignments.
Many of these stamps are sold to collectors or stamp enthusiasts, a channel that investigators are examining. The prevailing theory remains that the sender acted alone, possibly resembling an “Unabomber” profile, having acquired six stamps at once.
Gunpowder origins and handling
Evidence points away from fireworks shops as the source of the gunpowder; all signs indicate that the material was removed from hunting cartridge components. Investigators continue to pursue this lead while expanding their inquiry into the perpetrators behind the attacks on senior government officials.
Ongoing inquiries also involve security and defense channels, with mentions of high-level officials and international diplomatic sites as part of the broader investigative scope. Key locations tied to this matter include police and defense centers in the Madrid area, as well as allied international stations.
no postmark
The National Police’s specialized units carried out six controlled detonations of explosive letters. Two envelopes arrived intact, enabling forensic work to analyze handwriting for profiling and to attempt fingerprint and DNA recovery.
Additional findings indicate that the sender managed to breach some postal security measures, as two envelopes lacked a postmark, suggesting deliberate tampering.
The letters carried no writing beyond the addressee and sender. The sender identities are linked to several nonexistent email addresses, which investigators have flagged as unlinked to real individuals.
Regarding the payload, producers have speculated a mixture of gunpowder and shrapnel; however, analyses indicate the powder could have been sourced from pyrotechnic suppliers or firework products, with the working hypothesis that the author extracted it from hunting powder cartridges.
Other threats to the government
As the case develops, investigators assess multiple letters that carry a threatening tone. These messages align with a broader pattern of communications received by government bodies in relation to ongoing policy positions and support measures associated with international events and regional security concerns.
Several of the letters are handwritten, allowing handwriting analysis to contribute to the profiling work. Together with the six packet deliveries analyzed this week, authorities are reviewing whether any earlier communications of a similar nature were linked to the same author.