Four people were killed and 17 were missing after the most powerful typhoon to hit Japan in decades paralyzed Tokyo, flooding rivers and putting millions under evacuation warning before plowing up the northeastern coast.

Axar.az reports citing Reuters.

Authorities lifted rain and flood warnings for the Kanto region around a becalmed Tokyo before dawn, and by Sunday morning were starting to lift them on areas further north.

Typhoon Hagibis was expected to head out to sea on Sunday evening once it churned its way up the northeastern coast and the northern island of Hokkaido.

Four people died in Chiba, Gunma, Kanagawa and Fukushima prefectures surrounding Tokyo, public broadcaster NHK said. Among them was a man in his 60s who was found with no vital signs in a flooded apartment in Kawasaki, NHK said. Seventeen were missing early Sunday, it said.

In Fukushima, Tokyo Electric Power Co reported irregular readings from sensors monitoring water in its Fukushima Daiichi nuclear plant overnight. The plant was crippled by a 2011 earthquake and tsunami.

In parts of Fukushima and Nagano prefectures, heavy rain caused rivers to flood their banks, submerging houses and rice paddies and forcing some people to climb onto their roofs for safety.

Houses along the Chikuma river in Nagano were nearly under water and at least one person was rescued from the roof of a house by helicopter, NHK said. Part of a road was swept away in flooding.

Authorities issued evacuation advisories and orders for more than 6 million people across Japan as the storm unleashed the heaviest rain and winds in years. Some 100 injuries have been reported so far, while more than 270,000 households lost power, NHK said.