A huge explosion has rocked a Japanese nuclear power plant damaged by Friday’s devastating earthquake.

A pall of smoke was seen coming from the plant at Fukushima. Four workers were injured.

Japanese officials say the container housing the reactor was not damaged and that radiation levels have now fallen.

Officials of Japan’s nuclear safety agency also said after examination that they believe there has been no serious damage to the container of the No. 1 reactor, judging from the latest radiation data monitored around the facility.

The incident came after the plant lost its cooling functions after it was jolted by a magnitude 8.8 earthquake Friday and radioactive substances of cesium and iodine were detected near the facility Saturday.

The detection of the materials, which are created following atomic fission, led Japan’s nuclear safety agency to admit the reactor has been partially melting—the first such case in Japan.

Explosion heard at Japan’s Fukushima nuclear plant -- VIDEO

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Force India Formula One driver Giancarlo Fisichella of Italy, top, and Williams Formula One driver Kazuki Nakajima of Japan crash after the start of the F1 Grand Prix of Turkey at Istanbul Park on May 11, 2008.

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