Greek police are on alert following deliveries of parcel bombs to foreign leaders and embassies. Overseas mail has been halted for 48 hours.

The move came after police defused two makeshift explosive devices at Athens International Airport El. Benizelos. and at least three other packages around the city. No injuries or damage were reported. A package addressed to Italian Prime Minister Silvio Berlusconi ignited when authorities tried to open it yesterday at Bologna airport.

A package containing explosives was also sent to German Chancellor Angela Merkel office in Berlin.

Panagiotis Argiros aged 22 , one of the two men arrested in Pagrati, was detained for participation in the Conspiracy of the Cells of Fire" organization.

An arrest warrant on charges of supply, possession and production of explosives was pending . He is also blamed for the explosions at the office of Employment Minister, L. Katselis, the house of former undersecretary for Interior, P. Hinofotis and Macedonia- Thrace Ministry premises

Panagiotis Argiros, 22 denied to answer any questions on the parcel bombs case. On Thursday, P. Argiros and G. Tsakalos will be brought before the interrogator to make their statements on four felony and four misdemeanor charges regarding the parcels containing explosives.

It is believed that release of pictures of members of "Conspiracy of Fire Cells" organization will lead either to another member wanted or the organization's hide out.

In the meantime, results of tests later in the day will indicate the explosive material used in the 13 parcel bombs.