( CNN ) -- Italian police on Monday found an explosive package at the Greek Embassy in Rome , the second time in as many weeks that embassies there have received explosives through the mail . The parcel did not explode , and authorities hope that it will provide information that will help in their investigation . Police also responded to other reports of suspicious packages at the Venezuelan and Danish embassies in Rome and possibly other embassies as well on Monday . But only the Greek embassy package contained an explosive , according to Francesco Tagliente , the chief of police in Rome . `` The alarm system has worked , '' Tagliente said . `` Since this morning , all the embassies that had a suspected package alerted the police in enough time to determine whether the packages were dangerous and prevent any injuries . '' Late last week , an anarchist group claimed credit for a pair of mail bombings Thursday at embassies in Rome , vowing in messages that it plans more such acts to `` destroy the systems of domination , '' the state-run ANSA news agency reported . Police said that the Informal Federation of Anarchists -- an offshoot of the Italian Anarchist Federation , or FAI -- claimed responsibility for attacks at the Swiss and Chilean embassies . Tagliente said that Monday 's packages , which included a note from the FAI , were `` certainly related '' to the ones last week . Computer-written notes were sent in small boxes along with the earlier package bombs , according to ANSA . The messages read : `` We have decided to make our voices heard again , in words and deeds . We will destroy the system of domination . Long live FAI . Long live anarchy . '' The notes also referenced Lambros Fountas , who was shot dead last March while protesting in Athens . The 35-year-old has since become a martyr for the international anarchist movement , particularly groups in Greece , Italy and Spain . Formed in 1945 , Italian Anarchist Federation had seen a `` a slow but constant increase '' of supporters in recent years , said the website of an umbrella group , L'International des Federations Anarchistes . The Italian organization aims for `` radical change '' in support of `` oppressed and exploited peoples , '' doing so with opposition to political powers and even the Catholic Church , the website said . There was no warning before a Swiss-born , 53-year-old mailroom worker was seriously hurt by an explosion while opening a package at the Swiss Embassy , according to police and the Swiss Foreign Ministry in Bern . One person was taken to a hospital when the second bomb exploded shortly afterward at the Chilean Embassy , police said . Italian Foreign Minister Franco Frattin called the attacks `` a serious threat against foreign embassies in Rome . '' He said that authorities were checking all embassies in Rome and Italian embassies aboard for suspicious packages . `` We should avoid being alarmist , '' Frattin said . Italian Interior Minister Roberto Maroni said the incident is similar to a wave of letter bombs sent last month by an anarchist group based in Greece and claimed the bombs came from there . But Greek officials disputed the notion that anyone in their country was involved in the blasts . `` There is no evidence that the bombs originated in Greece , '' Foreign Ministry spokesman Grigoris Delavekouras said . In addition to the Swiss and Chilean blasts , a `` suspicious package '' was found at the Ukrainian Embassy in the Italian capital , police said , but it turned out not to be dangerous . There were also false alarms at the Slovenian and Estonian embassies . In November , police discovered 14 parcel bombs emanating from Greece , most of which were sent to various embassies in Athens . Police intercepted and destroyed most of them in controlled explosions , but a woman at a courier office was wounded by one of the devices and another device exploded in the courtyard of the Swiss Embassy . Two men accused of participating in the bombings were remanded into custody after they were arrested in Athens in possession of two parcel bombs , Glock pistols , a bulletproof vest and a wig . Panagiotis Argyrou , 22 , and Gerasimos Tsakalos , 24 , were also in possession of a delivery slip for another parcel containing an explosive device that had been delivered to a courier service and was addressed to the Dutch Embassy , police said . Hellenic Police spokesman Maj. Athanasios Kokkalakis called the two suspects `` important members of a terrorist group . '' Before the attacks , Argyrou already faced an arrest warrant alleging his membership in an illegal organization called the Conspiracy of Cells of Fire . Greek authorities stressed that they believed the wave of letter bombs in November was the work of a home-grown Greek terrorist group that does not have ties to international organizations like al Qaeda . CNN 's Jonathan Wald contributed to this report .
NEW : Police chief says only FAI parcel contained an explosive . Chief : `` The alarm system has worked '' An anarchist group claims responsibility for the bombings at the Swiss , Greek embassies . A Italian official disputes an Swiss minister 's claim that the bombs originated in Spain .