The Tokyo metropolitan government raised its COVID-19 alert to the highest of four levels Thursday amid a resurgence of coronavirus infections.

The decision was made after the highly-transmissible BA.5 Omicron subvariant saw Japan enter its seventh wave of infections.

Related coverage:

Japan unlikely to ask people to curb activities despite COVID spike

Japan's new COVID-19 cases top 90,000, 1st time in 5 months

Japan logs most COVID cases since March, delays domestic travel plan