Rescue efforts are underway to find survivors after Typhoon Hagibis left vast sections of towns in central and eastern Japan under water.
More than 110,000 police officers, fighter fighters, soldiers and coastguard personnel, as well as some 100 helicopters have been mobilised for Monday's rescue operations, officials added.
"There still are many residents who have yet to be accounted for. Our people in uniform are working day and night in search and rescue operations," Prime Minister Shinzo Abe told an emergency meeting of ministers.
"Damage has been made in an extremely wide range of areas, and more than 30,000 people are still being forced to remain in the state of evacuation."
Typhoon Hagibis made landfall on Japan's main island of Honshu on Saturday, leaving at least 40 people dead and 189 injured.
The US Central Command said it will begin implementing a blockade of all maritime traffic entering and exiting Iranian ports on April 13 at 10 a.m. ET (1400 GMT), after President Donald Trump said the US Navy would start blockading the Strait of Hormuz.
Hungary's veteran nationalist leader Viktor Orban conceded defeat on Sunday after a landslide election victory by the upstart opposition Tisza party, in a setback for his allies in Russia and US President Donald Trump's White House.
President Donald Trump said on Sunday the US Navy would immediately start blockading the Strait of Hormuz, raising the stakes after marathon talks with Iran failed to reach a deal to end the war, jeopardising a fragile two-week ceasefire.
At least 200 people are feared dead after Nigerian military jets struck a village market while pursuing rebels in the northeast of the country on Saturday night, a councillor for the area and residents said on Sunday.
Russia and Ukraine accused each other on Sunday of breaching the 32-hour ceasefire in their four-year war, reporting more than a thousand drone and shelling attacks just hours after the truce began on Saturday to mark Orthodox Easter.