Japan is struggling to contain a growing crisis at two nuclear power plants damaged in Friday's huge earthquake and tsunami, as officials revealed that the emergency cooling system at another reactor had failed, raising fears of a serious accident. Officials said the negligible radioactivity levels near the plants in Fukushima prefecture posed no threat to human health. Screening centres were bein
![Japan nuclear plant faces new threat](https://cdn-ak-scissors.b.st-hatena.com/image/square/19a938506cbc95e760f5481357bdcf742e3c07ab/height=288;version=1;width=512/https%3A%2F%2Fi.guim.co.uk%2Fimg%2Fstatic%2Fsys-images%2FGuardian%2FPix%2Fpixies%2F2011%2F3%2F13%2F1299974656020%2FFukushima-officials-007.jpg%3Fwidth%3D1200%26height%3D630%26quality%3D85%26auto%3Dformat%26fit%3Dcrop%26overlay-align%3Dbottom%252Cleft%26overlay-width%3D100p%26overlay-base64%3DL2ltZy9zdGF0aWMvb3ZlcmxheXMvdGctYWdlLTIwMTEucG5n%26enable%3Dupscale%26s%3D3f72b9e552281fe32ffde25d665f480f)