WASHINGTON -- The Customs Service refused to let 13 sea containers destined for the United States be loaded onto ships at foreign ports because of insufficient details about their contents, a violation of a new federal rule. The agency says it needs timely and accurate manifest information to effectively evaluate and identify cargo that may pose a risk to U.S. security. With 5.7 million cargo containers entering U.S. seaports each year, Customs says it is critically important to prevent terrorists from using sea containers to smuggle nuclear, chemical, biological or other deadly weapons into this country.