Source (greek only): Eleftherotypia - http://www.enet.gr/online/online_text/c=112,id=91228912
According to "Eleftherotypia newspaper report the "Revolutionary Attack Groups" (Epanastatikes Omades Epithesis) claim responsobility for the arsons of "Group 4 Securicor" vehicles in Kolonos, Athens. "On Dec. 24 we attacked the private guard company "Group 4-Wackenhut" headquarters destroying around 15 vehicles used in money transfers. This company, apart from owning private prisons in America and England, in our country constitutes the most important piece of the growing police-like corp of security professionals that floods the streets, breeding the big brother shoving cameras, circulating the banks' wealth and guarding diverse capitalist targets contributing in the increasing social control and repression."
They also mention:
"The message here is clear. When dealing with the rage of insurgents they cannot be safe, even in their headquarters. Our attack was an action of solidarity to our emprisoned comrades: Giannis Dimitrakis, Giorgos Voutsis-Vogiatzis, Marios Tsourapas, Chrissostomos Kontorevithakis, Vaggelis Botzatzis as well as to the prisoners of the Revolutionary Organisation November 17 that are being kept under a state of total isolation. It is an action of solidarity to the insurgent prisoners of April, many of whom face torture and constant transfers. It all continues..."