Pfizer, however, found no cases of muscle damage in an analysis of 9, 000 Lipitor users, some of whom were ingesting high doses.

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On Tuesday, the U.S. National Transportation Safety Board said it was conducting a chemical analysis of internal short circuiting and thermal damage of the battery that caught fire in Boston.

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The guidance, once again, was that after careful analysis of data, radiation levels and damage assessments to all units at the plant, our independent experts at the NRC are in agreement with the response and measures taken by Japanese technicians, including their recommended 20-kilometer radius for evacuation and additional shelter-in-place recommendations out to 30 kilometers.

WHITEHOUSE: Press Briefing

Officials said it is too early to confirm the extent of damage, but computer models developed by Kinetic Analysis Corporation, a Silver Spring, Md.

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We are now saying, based on our independent analysis of the deteriorating situation -- we all have watched on television and read about the damage at the various reactors and the potential for emissions -- based on that new information, the new data, the independent analysis, the NRC is now advising an evacuation beyond a 50-mile radius.

WHITEHOUSE: Press Briefing