Police said the fierce blaze appeared to have been started deliberately but there was no immediate information on a possible motive.
Japan began its first commercial whale hunts in more than three decades on Monday, brushing aside outrage over its resumption of a practice that conservationists say is cruel and outdated.
Japan said on Monday it will tighten regulations on the export to South Korea of several chemicals used in chip and smartphone production amid a row with Seoul on wartime forced labour.
Leaders of the G20 including President Cyril Ramaphosa have wrapped up their summit in Osaka, Japan, with calls to strive for a free, fair and stable trade and investment environment.
Four years after the landmark Paris deal, international consensus on strong action to tackle climate change risks crumbling, with the issue among the biggest sticking points at this week’s G20 summit.