Police on Monday searched the homes of 17 anti-vaccine extremists who are accused of instigation to use weapons and commit crimes against leading figures in Italy's public institutions, including Premier Mario Draghi.
Monday's operation is related to a probe into threats made via the 'Basta Dittatura' channel-chat on the Telegram app.
The channel has been closed because of its content.
Several recent protests against the Green Pass COVID-19 health certificate have turned violent and caused massive disruption in many cities.
The Green Pass, which shows that a person is vaccinated for COVID-19, has recovered from it in the last six months or tested negative in the last few days, became obligatory to access places of work in Italy a month ago.
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