An al Qaeda affiliate in Algeria closed a base earlier this month after an experiment with unconventional weapons went awry, a senior U.S. intelligence official said Monday.

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A new dry wipe can clean up chemical agents such as mustard gas, giving soldiers a more convenient way to deal with toxic materials on the battlefield, U.S. researchers said on Wednesday. More Articles

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WASHINGTON - The United States can expect a terrorist attack using nuclear or more likely biological weapons before 2013, reports a bipartisan commission in a study being briefed Tuesday to Vice President-elect Joe Biden.

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An independent commission has concluded that terrorists will most likely carry out an attack with biological, nuclear or other unconventional weapons somewhere in the world in the next five years unless the United States and its allies act urgently to prevent that.

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A light-transmitting compound that could one day be used in high-efficiency fiber optics and sensors that detect biological and chemical weapons at long distance almost went undiscovered by scientists because its structure was too difficult to examine. More Articles

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"The dots, or in this case more than a thousand separate anthrax samples, were connected with the help of a group of scientists working secretly for some seven years.

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Construction work has begun near Washington on a vast germ warfare laboratory intended to help protect the US against an attack with biological weapon, but critics say the laboratory's work will violate international law and its extreme secrecy will exacerbate a biological arms  …

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"FBI hazardous material experts planned to search a home where police found pipe bombs and a jar containing the potentially deadly poison ricin, federal agents said Friday."

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