Montenegro's health authorities confirmed a new coronavirus case on Monday, a second in the last two days after no cases had been registered for 42 straight days.
Both cases are people who recently spent time in neighbouring Bosnia and Herzegovina. The authorities are now trying to identify their contacts.
A total of 326 cases of infection with the novel Covid-19 coronavirus have been discovered in Montenegro since mid-March.
On June 1 the country opened its borders to 130 countries where the number of active cases is below 25 per 100,000 inhabitants, including Croatia, and lifted most of the restrictions imposed to the contain the virus.
At the start of June, Montenegro declared the end of the coronavirus epidemic on its soil after no new cases were identified for 28 days in a row.
On May 24, Montenegro became the first coronavirus-free country in Europe.