Italian police say a parcel bomb was found Monday at the Greek embassy in Rome.
Police say the device failed to explode and was defused by bomb disposal experts.
The bomb arrived just days after two similar packages exploded at the Chilean and Swiss embassies in the Italian capital. Two staffers were wounded in those blasts.
Members of an anarchist group claimed responsibility for last week's parcel bombs, but there was no immediate claim for Monday's attempt.
Police across much of Europe have been on heightened alert since a suicide bombing in Stockholm earlier this month killed the suspected bomber and wounded two others. Last week, 12 terror suspects were arrested in Britain.