Greek authorities have launched an anti-terror investigation following a claim of responsibility by a previously unknown urban guerrilla group for two recent bomb attacks—one of which targeted Hellenic Train, the country’s main railway operator.

According to a statement posted Sunday on the Athens Indymedia website, a group calling itself Revolutionary Class Self-defence said it was behind the April 11 blast outside Hellenic Train offices. While the explosion caused only minor damage and no injuries, the group framed it as retaliation for the 2023 train disaster that killed 57 people—a tragedy widely blamed on inadequate infrastructure and chronic underfunding.

Greek police, who had evacuated the area ahead of the blast after receiving tip-offs from media outlets, are now assessing the authenticity of the claim. Investigators believe the group may be a new entity, but aren’t ruling out ties to older, dormant militant networks that have operated within Greece’s long-standing tradition of leftist and anarchist activism.

In their statement, the group denounced the privatization of Greece’s rail system—a move made during the 2009–2018 debt crisis—as a source of safety neglect and systemic failure. Hellenic Train, now owned by Italy’s Ferrovie dello Stato, has been at the center of scrutiny since the fatal 2023 collision, which exposed deep flaws in Greece’s transport infrastructure.

The group also claimed it carried out a separate 2024 bombing outside the Labour Ministry in Athens, which similarly caused no casualties thanks to prior evacuations. Both attacks, the group said, were also acts of solidarity with Palestinians amid the ongoing Gaza conflict.

Speaking to state broadcaster ERT, police spokesperson Constantina Dimoglidou confirmed that anti-terrorism units are actively investigating the group’s credibility and any potential connections to known radical factions. While small-scale attacks on government buildings, police, and foreign interests are not uncommon in Greece, this resurgence in activity is being taken seriously.

The country has a long and turbulent history with political violence, particularly from far-left groups. Just last year, a deadly blast in an Athens apartment killed one and injured another, adding to concerns about re-emerging underground networks.

With this latest claim, Greek authorities are on alert, navigating the fine line between political dissent and domestic terrorism in a nation still grappling with the scars of economic crisis and social unrest.