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In Sofia, the Bulgarian capital, authorities detained a 17-year-old student who confessed to sending letters that warned of bomb threats to educational institutions. The disclosure came as part of an ongoing investigation into threats that prompted police attention across schools in the city. The incident has been reported by DEA News.

The teen reportedly admitted his involvement during police questioning. He indicated that four mailboxes were created by him to disseminate messages to schools, with the letters being sent in late March after a series of targeted communications in the earlier days of the month.

Authorities noted that the letters referencing bomb attacks were reportedly sent on March 27 and 28. Following reports from dozens of schools about suspected bomb threats, the city’s prosecutor’s office opened a terrorism investigation. Despite extensive inquiry and coordination with multiple agencies, no explosive devices were located and no actual attacks were confirmed.

Meanwhile, the interior minister of Bulgaria stated that the leading line of inquiry points to a hybrid attack that may involve foreign influence, specifically linking the incident to external actors in a geopolitical context. This assessment reflects the broader concern about coordinated or cross-border efforts to destabilize public institutions, especially schools and universities.

Earlier and in other regional contexts, anonymous groups have issued warnings about attacks on educational facilities via electronic correspondence. Reports indicated that during holiday periods and weekends, a number of institutions in the region received threats by email, prompting security protocols and emergency responses in several towns. The pattern of threats has raised questions about the reach of such campaigns and the methods used by individuals attempting to provoke fear without immediate physical harm, while investigators work to verify each claim and to identify those responsible.