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Still, reports of radiation-tainted vegetables and tap water have added to public fears about the crisis in Japan and raised concerns in the U.S. about the possibilities of radiation contamination along the American West Coast.

Other Washington leaders warned Sunday that the crisis in Japan will inevitably affect the American nuclear industry, which in recent years had been the subject of much talk of a “nuclear renaissance.”

On CBS’s “Face the Nation,” Rep. Edward J. Markey, Massachusetts Democrat, said the accident “is calling into question of the viability of nuclear power in this country.”

Mr. Markey, who has called for a moratorium on the construction of nuclear power plants in earthquake-prone areas, predicted that the nuclear industry had met “its maker in the marketplace.”

“It won’t be protesters, it will be Wall Street investors raising questions about its viability going forward,” Mr. Markey said.