Police have stepped-up checks at Italian stations amid threats from protesters to disrupt high-speed trains on the first day of a Covid pass. The "green pass" is now compulsory for domestic flights, ferries and long-distance or fast trains as well as schools and universities. Increased security was reported at stations at Rome, Milan and Florence. Foreign Minister Luigi Di Maio has condemned a climate of hatred over the launch of the pass. He is one of several public figures to have been targeted by anti-vaccination protesters in recent days. Journalists and medical experts have complained of being stalked while Mr Di Maio faced death threats online. 'This measure is right' The pass, both digital and on paper, provides proof of at least one Covid-19 vaccination, recent recovery or a negative test. It is already required for entering cinemas, restaurants, gyms and swimming pools, but it is not needed on local buses. Passengers arriving for travel on Wednesday had their passes checked by rail staff, although children under 12 are exempt. "This measure is right, indeed it should also apply to regional trains," Rome passenger Alessia Colombi told Reuters. School staff are also required to show a pass and two teachers were turned away by the head of a Turin school, local reports said. Despite a vocal anti-vaccination minority, Italians have broadly backed the government's vaccination campaign, with 70.1% of over-12s now fully vaccinated, broadly in line with the EU average of 70% of adults having two jabs. However, health officials fear an increase in cases of the Delta variant.