The official line from the press conference being given by the Secretary General of Japan is "We don't know and we are investigating further, however radiation

The official line from the press conference being given by the Secretary General of Japan is "We don't know and we are investigating further, however radiation is still within acceptable levels." This means the only real update from this press conference is that the evacuation perimeter for Fukushima 2 (the second power plant) has been increased to 10km (from 3km). To the contrary, however, somebody was quoted that the explosion was the containment building for reactor vessel 1. If that is the case it would pretty much be the worst case scenario for both Japan and the future of nuclear power.