Here is a translation of the claim, sent via e-mail:
"Last night we set an incendiary device at the Ethniki bank of Agii Anargiri at Volos. We selected to attack in suck a way to cause material damages and even a minimum disorder to the normal flaw of money.
Banks will be an essential target as economic mechanisms of exploitation and also modern temples of the system that produce and recycle obedient consumers. It takes only one look upon the fake smiles of their stupid commercials, compared with the miserable reality of loans combined with the forced 8hours of work to spot the top of misery they call social peace.
It's right there where we target: to undermine it and to destroy it. That's why the time and place of the attacks isn't limited, their realisation doesn't wait for occasions. We aim to generalise and spread such offensive actions..
This action is dedicated to all imprisoned anarchists..."