A Greek prosecutor has ordered an official investigation into the causes of a door malfunction on an electric railway (ISAP) train running along the Athens-Piraeus route on Jan. 1.

The inquiry comes after the Urban Rail Transport Company (STASY) Employees Union filed a formal complaint alleging the doors of the train opened mid-transit.

According to the allegations, the incident occurred between the stops of Ano Patissia and Perissos while the train was in motion on New Year’s Day. Reports indicate that smoke was also observed during the incident.

“The company’s management and political leadership must urgently address the persistent issues of outdated rolling stock, staff shortages, and the lack of spare parts, as safety must always be the top priority,” the STASY Employees’ Union said in a statement in response to the malfunction.

The union emphasized that the incident highlights the critical need for immediate action to prevent future safety risks.

On Thursday, Aristeidis Koreas, head of the Athens Prosecutor’s Office, ordered a preliminary inquiry into the claims. The probe will also determine whether passenger safety was compromised and if this incident violates public transportation safety regulations. Such a violation would constitute a criminal offense under Greek law.

The incident has intensified calls for improvements to the country’s public transport infrastructure and reinforced the urgency of addressing safety concerns.