Tsunami, Japan Nuclear Crisis | featured news

Gregory Jaczko, head of the U.S. Nuclear Regulatory Commission, says the crisis is worse than Japanese officials appear to be letting on. 'This is a situation where people may be called in to sacrifice their lives,' he says of the crew working there.

Concerns over the deteriorating condition of Japan's stricken nuclear reactors, and the effect on global economies, sparked the Dow's biggest selloff since August and left the S&P 500 in the red for 2011.

Japan's devastating earthquake and deepening nuclear crisis could result in losses of up to $200 billion for the world's third largest economy but the global impact remains hard to gauge five days after a massive tsunami battered the northeast coast.

Aviation authorities across the globe are closely monitoring the radiation levels at  a Japanese nuclear power plant damaged in last week's earthquake and tsunami.