Police units had cordoned off the street outside an apartment building in the southern Athenian suburb of Nea Smyrni on Wednesday night where a man has taken his father hostage following an argument, Greek media reported.
The 35-year-old man, who reports say had been hospitalized in a mental institution and is a drug addict, has locked himself in a room with his father on a first-floor apartment, and is holding a knife.
Psychologists and a police negotiator have been trying to convince the suspect to drop the knife for the past three hours, to no avail.
The 35-year-old is known to the police, as he had been arrested in the past. Neighbors reportedly said the man often quarrelled with his family.