Police officers stand guard outside the Chilean embassy in Rome. Parcel bombs exploded at the Swiss and Chilean embassies in Rome on Thursday, injuring the two people who opened them, according to officials.

Rome - An Italian anarchist group claimed responsibility for parcel bombs on Thursday that wounded two people at the Swiss and Chilean embassies in Rome, a reminder of home-grown threats at a time of political instability in Europe.

A Swiss man was seriously wounded and was rushed to hospital. The employee at the Chilean embassy was less seriously hurt. A note was found stuck to his clothing, claiming responsibility for the attack on behalf of the FAI, or Informal Anarchist Federation.

“We have decided to make our voice heard with words and with facts, we will destroy the system of dominance, long live the FAI, long-live Anarchy,” said the note, written in Italian, which was released in the evening by the police.

The incidents bore similarities to an episode in Greece last month in which far-left militants sent parcel bombs to foreign governments and embassies in Athens.

The FAI is well known to Italian authorities. Intelligence services said in a report to parliament last year that it was “the main national terrorist threat of an anarchist-insurrectionalist type”.

In December 2009 the group claimed responsibility for a bomb that partially exploded in a tunnel under Milan's Bocconi University at 3am, causing no casualties.

No note was found at the Swiss embassy, but police said the packages that exploded were almost identical.

“Greece, Italy and Spain have seen the presence of anarcho-insurrectionalist groups that are tightly linked,” Interior Minister Roberto Maroni said before the note was found. “They are very violent.”

A Greek police official said they had so far not received a request for help from Italian police. He said Greek authorities had stepped up checks of parcels at airports across the country following the attacks in Italy.

Italian Foreign Minister Franco Frattini condemned the incidents, which he said were a serious threat to diplomatic missions in Rome. He urged caution and warned against alarmist reactions.

The attacks, like those in Greece, focused attention on Europe's domestic security threats at a time when authorities had otherwise been warning of the risk of attacks by al-Qaeda.

“It doesn't look like a typical jihadist thing. It looks more like the act of a leftist, fringe group,” said Stephan Bierling, professor of International Politics at Regensburg University in Germany.

The explosions came at a time of tension in Italy. Last week saw an anti-government student protest that descended into some of the worst street violence in Rome for many years.

Spending cuts caused by the financial crisis have led to demonstrations and strikes around Europe, and experts expect a rise in political violence by far-left groups.

“Given the similarities with the recent parcel bombs in Greece following anti-austerity protests, this could be a copycat incident by domestic activists,” said Samantha Wolreich, European risk analyst at advisory firm AKE. - Reuters