http://english.kyodonews.jp/news/2011/03/78374.html
"The situation at the quake-hit Fukushima No. 1 nuclear plant in northeastern Japan ''has worsened considerably,'' the Institute for Science and International Security said in a statement released Tuesday.
Referring to fresh explosions that occurred earlier in the day at the site and problems in a pool storing spent nuclear fuel rods, the Washington-based think tank said, ''This accident can no longer be viewed as a level 4 on the International Nuclear and Radiological Events scale that ranks events from 1 to 7.''
"Noting that a level 4 incident involves ''only local radiological consequences,'' it said the ongoing crisis is ''now closer to a level 6, and it may unfortunately reach a level 7'' -- a worst case scenario with extensive health and environmental consequences."