On 16 March, President of Emilia-Romagna Stefano Bonaccini imposed a strengthened quarantine on the municipality of Medicina, near Bologna, since it had developed an intense outbreak. People were not allowed to enter or exit the town for any reason. In early April, Lombardy and Tuscany made it compulsory for all residents to wear a face mask when leaving their home. The strategy of mass-testing asymptomatic carriers was proven to be successful in stopping the spread of the virus in one Italian town. This strategy in Italy was supported by the region of Veneto. On 22 February, the government established a lockdown for eleven municipalities in Lombardy and Veneto. On 7 March, the government prepared to extend until 3 April the restricted zone to all of Lombardy, plus fourteen other provinces in Veneto (3), Emilia-Romagna (5), Marche (1) and Piedmont (5). The lockdown affects over 16 million people, roughly a quarter of Italy's total population, and prevents people from entering or leaving the zone, except "for proven occupational needs or situations of need or for health reasons", under threat of fines. The enclave nation of San Marino, which is nestled between two of the provinces, has been effectively locked down as well. On 9 March, Prime Minister Conte announced that the lockdown would be extended to the entire country. On 23 February 2020, Austria suspended all trains to and from Italy for a few hours because of suspected cases. Romania instituted a quarantine for people arriving from Lombardy and Veneto. On 24 February, an Alitalia flight from Rome to Mauritius was blocked at the Sir Seewoosagur Ramgoolam International Airport by the local authorities, who imposed quarantine or repatriation for 212 Italian passengers. Of the 212 passengers, 172 were allowed to disembark while 40 passengers from Lombardy and Veneto decided to go back to Italy. An intercity bus operated by Flixbus from Milan to Lyon was quarantined at Gare de Lyon-Perrache station so that its passengers could undergo health checks. Brazil added Italy to its COVID-19 alert list, meaning that passengers entering Brazil from Italy showing flu symptoms would undergo medical checkups. Argentina, France, Croatia, Egypt, Greece, Ireland, Israel, Latvia, Lithuania, Ukraine, Serbia and South Africa issued multiple recommendations that included postponement of school trips to Italy, a 14-day quarantine for people arriving from Lombardy and Veneto and a warning for all citizens to not to travel to regions of Italy affected by the outbreak.