shooter is refusing to talk and has asked for an attorney. the sheriff s department says he could be tried and charged as an adult, norah. o donnell: nancy chen with that breaking news. thank you, nancy. we want to turn now to theoid pandemic. the head of the federal reserve said today that the new variant, omicron, could throw a wrench into america s economic recovery, slowing hiring and hampering the fight against inflation. well, that sent shock waves through wall street. the doug fell more than 600 points. that s a loss of nearly 2%. more than 200 cases of the new have turned up in 20 countries. we get more now from cbs errol barnett. reporter: even before omicron cases are confirmed in the u.s., tonight, researchers are preparing for its arrival, racing to analyze the strength of the arsenal to fight it. today, moderna s c.e.o. told the financial times there is no world where his companiay vaccine has the same level of effectiveness against omicron as it does with the delta