ATHENS, Greece (AP) — A small far-left group in Greece has claimed responsibility for a Dec. 22 bombing at an Athens courthouse that caused extensive damage but no injuries.

The Popular Fighters Group said in a post on a far-left website on Wednesday it attacked the Athens Court of Appeal to protest what it said was bias by Greek judges that favored the rich and powerful in several high-profile court cases.

The group also complained that Greek courts failed to uphold legal challenges against painful income cuts and tax hikes implemented under the country's bailout program.

The group previously claimed responsibility for shots fired at the German ambassador's residence in Athens four years ago and bombings targeting a Greek industry federation in late 2015 and outside a bank in April. No injuries resulted from those incidents.