ATHENS, Feb. 2 (Xinhua) -- Greek police is on alert for a possible new string of attacks with parcel bombs, after the detonation of a booby-trapped package at the Justice Ministry building in Athens on Wednesday, local media reported.

According to reports, the suspicious package which was spotted and detonated by experts at the ministry building earlier on Wednesday, did contain a bomb device after all.

Police sources said the parcel was addressed to Justice Minister Haris Kastanidis and it was similar to the parcel bombs sent to a dozen foreign embassies in Athens and European leaders, including German Chancellor Angela Merkel, French President Nicolas Sarkozy and Italian Prime Minister Silvio Berlusconi, last November.

The Greek guerilla group "Conspiracy of the Nuclei of Fire" has claimed responsibility for those attacks which caused the slight injury of a citizen.

No injury occurred on Wednesday and no group has claimed responsibility yet, but local analysts said that "Conspiracy of the Nuclei of Fire" has threatened with further attacks against judicial, political and police targets, as a dozen of suspected members of the group are currently on trial for a third week in Athens.

Greece has a decades-long history of domestic terrorism.