In a strong statement, Israel's health ministry warned that nine South Korean tourists who visited the country recently have tested positive for coronavirus upon returning home.
The ministry called on anyone who may have come into close contact with the tour group for an extended period of time to self-quarantine.
The tourists visited some of the most popular sites in Israel and the West Bank from February 8 to 16, increasing the chance of a large-scale exposure in the region, the ministry said Saturday.
Providing a list of dates and locations, the ministry warned that anyone who came within two meters of the group for more than 15 minutes should self-quarantine for 14 days.
The group visited Masada in southern Israel, the Cave of the Patriarchs in Hebron, and the Church of the Holy Sepulchre in Jerusalem.
The potential for a large-scale exposure appears to be high given the number of tourists who regularly visit these sites and others.
The release of the statement on a Saturday is an indication of how seriously authorities are taking the threat of coronavirus spreading in Israel. Government statements are rarely released on Saturday in Israel since it is the Sabbath.
This comes after Israel announced its first case of the coronavirus on Friday. The victim is an Israeli woman who returned from the Diamond Princess cruise ship in Japan.
She was one of 11 passengers flown back from the Diamond Princess. The other 10 tested negative for the virus. All of the passengers remain quarantined in hospital.