World News Roundup

March ends with another mass shooting -- four dead including a child at a Southern California office building. Jurors view police body cam footage at the Derek Chauvin murder trial. New information from Pfizer on the longevity of its COVID-19 vaccine. Correspondent Steve Kathan has the CBS World News Roundup for Thursday, April 1, 2021: Learn more about your ad choices. Visit megaphone.fm/adchoices