Four parcel bomb attacks - allegedly targeting French president Nicolas Sarkozy and three embassies - have been foiled by Greek police after one of the devices exploded at a delivery service.
Motorcycle police later detained two Greek men, aged 22 and 24, several hundred yards from the blast site in central Athens.
The men were carrying handguns and bullets in waist pouches, and one of them wore a bulletproof vest, a wig and a baseball cap.
Domestic political extremists are suspected, and one of the two men detained had been wanted in connection with a Greek radical anarchist group.
No link was made with the Yemen-based mail bomb plot.
Parts of Athens city centre were cordoned off for more than an hour as the three unexploded bombs, found at a different delivery service and in the suspects' backpacks, were defused in a series of controlled explosions.
As well as Mr Sarkozy, the targets were the embassies of Mexico, the Netherlands and Belgium. The return address labels included the names of a senior government official, a Greek charity, and a well-known Greek criminologist.
The one that exploded was addressed to the Mexican embassy. The one addressed to the Dutch embassy was found and defused at a delivery service.
The other two - the one addressed to the Belgian embassy and the one addressed to Mr Sarkozy - were found on the suspects.
Police were searching other courier services and post offices to check whether other parcel bombs had been sent.