12 March 2011 Last updated at 05:24 ET
A massive explosion has struck a Japanese nuclear power plant after Friday's devastating earthquake.
A huge pall of smoke was seen coming from the plant at Fukushima and several workers were injured.
Japanese officials fear a meltdown at one of the plant's reactors after radioactive material was detected outside it.
A huge relief operation is under way after the 8.9-magnitude earthquake and tsunami, which killed more than 600.
With everything else going on this is not good.