Smoke seen from Japanese No.3 reactor

TOKYO, (Reuters) – Firefighters postponed spraying  Japan’s badly damaged nuclear reactor No. 3 with seawater toay after a plume of grey smoke was seen over the structure,  the government said.
Smoke began to rise from the plant’s No.2 and No.3 reactors  today, just as authorities had begun to show signs of  progress in its efforts to avert nuclear disaster at the site.  Japan’s nuclear safety agency later said the smoke had stopped  rising over the reactor.
The plant operator said it did know what caused the smoke.