The government has pledged to fix within a week bugs that have caused operation of its coronavirus contact-tracing smartphone app to be halted, the health minister Katsunobu Kato said Tuesday.

The free app, which was launched Friday and had been downloaded around 3.71 million times as of Tuesday morning, erroneously accepts reference numbers not issued by the Health, Labor and Welfare Ministry, said Kato, the minister responsible for the system, at a news conference.

The issue has forced the ministry to temporarily stop the app from issuing any alerts.