The mass shooting at an elementary school in Uvalde, Texas comes just days after 10 people were killed in Buffalo, New York and after a gunman targeted a California church. A new FBI report shows the number of active shooter incidents in the U.S. last year jumped more than 50 percent compared to the year before.Tune into Top Story with Tom Llamas weekdays at 7 p.m. on NBC News NOW.Top Story Playlist: