A massive 8.8 magnitude quake hit the northeast coast of Japan on Friday, shaking buildings in the capital Tokyo, causing "many injuries", at least one fire and triggering a four-metre (13-ft) tsunami, NHK television and witnesses reported.
There was also a warning of a 10-metre tsunami following the quake, Japan's biggest in 7 years.
The public broadcaster showed flames and black smoke billowing from a building in Odaiba, a Tokyo suburb, and bullet trains to the north of the country were halted.
Black smoke was also pouring out of an industrial area in Yokohama's Isogo area.
TV footage showed boats, cars and trucks floating in water after a tsunami hit the town of Kamaichi in northern Japan.