A car belonging to a prison guard working in the Domokos penitentiary, central Greece, was torched early on Tuesday morning, state-run news agency ANA-MPA reported.
The vehicle, which was parked outside the apartment building where the man lives in the city of Lamia, was completely destroyed, while an adjacent car and motorcycle were also damaged.
Neighbors alerted the fire service when they saw flames and smoke at around 3.30 a.m., the agency reported.
The prison guard, who previously served as a warden at Domokos Prison, was working the night shift and was not at home at the time of the incident.
Speaking to the police after the attack, he described it as a terrorist act, adding that he had recently received threats.