NEW : More than 11,000 are dead or missing in the wake of the disaster . STORY HIGHLIGHTS A fire and explosion Tuesday at the nuclear plant led to temporary radiation spike . One company says the disaster could be the most expensive in history .
NEW : More than 11,000 are dead or missing in the wake of the disaster . A new fire is discovered at the Fukushima Daiichi plant . A fire and explosion Tuesday at the nuclear plant led to temporary radiation spike . One company says the disaster could be the most expensive in history .