Four police officers were injured when a police station in central Athens was attacked with Molotov cocktails on Monday evening.
A group of about 50 self-styled anarchists firebombed the station near Omonia Square that also damaged several vehicles.
The assailants hurled around 40 home-made petrol bombs at the van and then reportedly fled towards Exarchia.
Four police officers suffered minor injuries in the raid and were transferred to a military hospital for treatment — two with scratches and the other two with breathing problems.
The hail of Molotov cocktails damaged the outside of the police precinct, as well as five parked cars and three patrol vehicles.
There was no immediate claim of responsibility for the firebombing. Anarchist groups frequently target police and banks in the Greek capital.