Fearing a threat of spreading rapidly to Europe, Japan on Saturday issued travel advisory to people throughout its long-established economy.

Japan has reported 5, 918 cases, 892 deaths and 2, 669 recovered ones. In an effort to contain the virus, government has voluntarily closed its borders except to Chinese citizens, recently repatriated Japanese and recently returned foreigners.

The number of confirmed cases was at 4, 242, up sharply from 4, 123 a day earlier.

But despite the steady fall in cases, several Japanese have questioned why the government has logged so many cases.

Why Japan is still reporting so many infections is a mystery. The government has not commented on the reports.

“We have no clue as to what is causing the sudden increase, ” one Twitter user asked Tokyo Governor Yuriko Koike. “Does the virus have something to do with people in Japan who have returned and have gone abroad and have become infected?”Economy Minister Yasutoshi Nishimura said Japan was not suffering from a “pocket rocket” recession, but added it could be an acceleration of the virus’s spread.

Japanese authorities say they have managed to contain the virus without any new large-scale outbreaks and their economy is now returning to a near-recovery pace.

But the country is during the height of the spring tourist season, and the government encourages people to continue traveling to save money.

Japan’s biggest hotel operator, Hyatt Hotels Holding, ordered its 73 hotel rooms in Tamashima to be shut down immediately until April 14 as officials warned the region to be in quarantine for 14 days.

The tourism sector, which accounts for nearly all hotels in the Tokyo metropolitan area, said it was canceling or halting nearly 90% of its usual spring openings in hopes of slowing the virus’s momentum.

Until April 14, restaurants, indoor entertainment venues and entertainment parks were allowed to open health ministry-approved locations, but only on the basis of a two-week outbreak, occasionally recommending against outdoor activities. (Interactive graphic tracking global spread of coronavirus: open tmsnrt. rs/3aIRuz7 in an external browser. )