Milan - Italian police arrested a Tunisian and Pakistani on Wednesday on suspicion they were plotting attacks in Italy and circulating threatening messages on the Internet in support of ISIS.
The men were arrested in Brescia, a small city near Milan, police said in a statement, without naming either man.
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It said the Tunisian man, aged 35, had created a Twitter account from which he posted "threatening messages signed ISIS" with the backdrop of famous landmarks such as Rome's Colosseum and Milan's cathedral.
Police were due to give details at a news conference later on Wednesday.
Italian security forces have for months been on high alert against attacks at embassies, synagogues, churches, the Vatican and areas usually crowded with tourists.