In December, Italian anarchists sent letter bombs to the embassies of Greece, Chile, and Switzerland in Rome as part of a campaign with jailed comrades in Greece.
The explosion in Switzerland occurred as staff were opening mail in the fourth-floor office of Swissnuclear, a lobby group representing several Swiss power companies.
A police spokeswoman said two female staff members suffered superficial injuries.
Opponents of nuclear power in Switzerland have become more vocal in recent weeks as images of the stricken Fukushima reactor in Japan appear on the evening news bulletins daily. Last month, the Swiss government froze plans for the construction of nuclear plants pending a safety review.
In Italy, a package bomb exploded at the barracks of a parachute brigade in Livorno. A senior military official, Lieutenant Colonel Alessandro Albamonte, was injured on his hands and face after opening the package, though his life was not in danger, the army said.
Hours earlier, Greek police defused a mail bomb sent to the governor of Korydallos prison in western Athens, where alleged members of an armed anarchist group are on trial.
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