Mystery death in Russian lab​Mystery death in Russian lab 

 U.S. officials are closely monitoring a situation in Russia after a woman died last week. Authorities say she worked at a lab that studied the plague. NBC News’ Anne Thompson has the story.  ​​U.S. officials are closely monitoring a situation in Russia after a woman died last week. Authorities say she worked at a lab that studied the plague. NBC News’ Anne Thompson has the story.