One police officer was injured by gunfire outside the main offices of the PASOK political party in central Athens on Tuesday morning, after a lone gunman opened fire at a group of riot squad police guarding the site.
The attack took place at 6.20 a.m. (04.20 GMT).
The policeman was wounded in the leg and taken to a military hospital.
Three spent shell casings from a handgun were found a short distance from the attack.
PASOK's offices has repeatedly come under attack over previous years by the more violent strains of so-called "anti-state" guerrillas and self-styled anarchists, with a permanent police guard stationed outside the nondescript building on Charilaou Trikoupi street.
