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Italian police stand at the entrance of the Swiss embassy downtown in Rome. Embassies, ministry buildings, post offices and the parliament were under tighter security after two explosions on Thursday. Image Credit: Reuters

Rome: Rome was on high alert on Christmas Eve after parcel bomb blasts left two staffers at the Chilean and Swiss embassies in the Italian capital badly injured in an attack claimed by anarchists.

Embassies, ministry buildings, post offices and the parliament were under tighter security after the two explosions on Thursday and false alarms in three other foreign embassies and two local government buildings in Rome.

The Chileanwas injured as he opened a package delivered to the embassy lost two fingers and was wounded in the chest and one eye, hospital sources said. It is feared the Swiss embassy worker wounded in the same way could lose his hand.

Chilean Foreign Minister Alfredo Moreno said the attack was "cowardly" and "an act of terrorism," while Swiss Foreign Minister Micheline Calmy Rey condemned "such malicious and unforgivable acts in the strongest terms."

Both bombs were contained inside plastic VHS video boxes packed with gunpowder and metal fragments connected to a nine-volt battery and a light bulb filament, La Repubblica newspaper reported, citing investigators.

An insulating tape kept the bombs from going off until they were opened.

A group calling itself the Informal Federation of Anarchy, or FAI under its Italian acronym, claimed responsibility in a blackened note found at the scene of the Chilean embassy blast amid fragments of the package that exploded.

The FAI has carried out a number of small attacks in Italy in recent years.

"We have decided to make our voice heard with words and deeds. Let us destroy the system of domination... Long live anarchy," the statement said.

The note also expressed solidarity with "comrades in prison" and fellow anarchist groups in Argentina, Chile, Greece, Mexico and Spain.