A little-known anti-fascist group says it was behind a bomb attack on an office of Greece's far-right Golden Dawn party.

The device was planted outside a branch of the party near Athens on Tuesday, but caused no injuries.

The Anti-Fascist Front said: "We decided to hit Golden Dawn's offices because we believe that you have to hit out at fascists first, before they hit you."

Greek activists and politicians have called for Golden Dawn to be banned. Its members have been seen giving Nazi-style salutes but they deny it is neo-Nazi.