TOKYO - A cloud of white smoke was rising Wednesday above a quake-stricken Japanese nuclear power plant, live TV footage showed.
The cause of the smoke, at the Fukushima No. 1 plant 250 kilometers (155 miles) northeast of Tokyo, was not immediately known.
A fire broke out early Wednesday at the number-four reactor there but was said to have been extinguished later.
Engineers have been grappling with a nuclear emergency since last Friday's massive earthquake and tsunami cut power to the plant and caused reactor fuel rods to heat up dangerously.
There have now been four explosions and two fires at the complex.