The moment nuclear plant chief WEPT as Japanese finally admit that radiation leak is serious enough to kill people
- Officials admit they may have to bury reactors under concrete - as happened at Chernobyl
- Government says it was overwhelmed by the scale of twin disasters
- Japanese upgrade accident from level four to five - the same as Three Mile Island
- We will rebuild from scratch says Japanese prime minister
- Particles spewed from wrecked Fukushima power station arrive in California
- Military trucks tackle reactors with tons of water for second day
