ATHENS, Sept. 3 (Xinhua) -- Greek militant group "Conspiracy of the Nuclei of Fire" claimed on Tuesday the responsibility for the latest attack with a parcel bomb which occurred on Sunday night in Athens against a judge, warning of more to come.
Sunday's hit did not cause any injuries. The target, who has dealt with terrorism cases, threw away the envelope which was delivered to his residence, as he considered it suspicious. The explosive device went off without causing major damages.
Counter-terrorism officials fear that guerilla groups which operate in Greece for years might step up attacks in the near future and target envoys of international lenders in Athens, according to local media reports.
Tuesday's proclamation which was posted on the Internet focused on judges, explaining that attacks against judiciary targets are in revenge for the arrests of dozens of members of the group in recent months.
However, daily "Ta Nea" (The News) reported citing sources that police officials fear for "upgraded" attacks against financial targets in coming weeks or months and have increased security measures against possible attacks.
These potential targets include envoys of the so-called troika creditors -- the European Commission, European Central Bank and International Monetary Fund, who are due back in Athens next week for a regular audit of Greek finances, according to the media reports.
Greece has suffered from domestic terrorism over the past three decades. In recent years, in particular after the start of the debt crisis which has hit hard the country and the rounds of harsh austerity measures introduced to tackle it, guerilla groups have targeted political, police, judicial and financial targets for their attacks.
In most cases, hits were made with parcel bombs or other explosive devices of minor strength which caused only material damages and slight injuries.
In one of the most serious attacks this year in January unidentified persons fired with an automatic rifle at the ruling conservative party's headquarters and one of the bullets reached the prime minister's office.