More photos: http://athens.indymedia.org/front.php3?lang=el&article_id=926825
According to the mass media (http://www.zougla.gr/news.php?id=13731) a subsidiary of Millennium Bank was attacked probably with molotovs, since the policemen didn't found any device near, and wrecked, while 6 fire brigade trucks were needed to put the fire off.
Update: «A sign of solidarity to the thousands of hungerstrikers in the dungeons of democracy" was according to an unknown person's phone call to "Eleftherotipia" newspaper the incendiary attach a few minutes after 11:30 in the night of Tuesday, at a Millenium bank branch, on 25 Pentelis Avenue, Halandri. "We encourage the justice minister and the prison guards not to mess around with fire. Victory to the prisoners struggle untill the destruction of every last prison".