Three bomb blasts have hit a central Athens police station, Reuters news agency has quoted a Greek police official as saying.
It is not clear if there are any casualties or damage to the building.
http://www.sky.com/skynews/article/0,,30200-1133976,00.html The police official said authorities had received an anonymous warning that the three explosive devices would go off at the police station in Kalithea.
Greece is due to host the Olympics in August, amid fears the games could be a target for political violence.
