A powerful typhoon pummeled Tokyo Wednesday and is now taking aim at Japan's tsunami-ravaged northeastern coast.

Typhoon Roke, packing heavy rains and winds of more than 100 miles per hour, has already left at least six people dead or missing, according to police and local media.

Weather officials predict the system will pass through Japan's disaster zone tonight.

Authorities, fearing typhoon-triggered flooding or mudslides, are evacuating more than 1 million people. 

"We need to exercise maximum caution against heavy rains, strong winds, and high waves in wide areas from eastern to northern Japan," Reuters quoted Chief Cabinet Secretary Osamu Fujimura.

The Fukushima Dai-ichi nuclear power plant, crippled by the March 11 earthquake and tsunami, is also in the path of Roke.

Takeo Iwamoto, spokesman for Tokyo Electric Power Co, said the plant's cooling system will not be put in danger by the storm.