Four people have been injured after being stabbed in a knife attack in the Greek capital city, Athens.

       Police said the attack occurred in the Zografou suburb on Wednesday morning.

       According to reports, a man wounded passersby apparently indiscriminately with a large knife outside a grocery store, leaving the pavement stained with blood.

       A suspect was arrested in connection with the incident after he called the police, Greek authorities said.

       The man, a Greek national, was detained after police entered his basement apartment near where the stabbings took place.

       Four people were hospitalised with knife wounds, but none are believed to be in a life-threatening condition.

       An investigation into the incident, including the suspect's motive, has been launched.