and it will spread further because it is highly contagious. reporter: as scientists scramble to learn more about the omicron variant, tonight the white house says nothing is off the table as they think about potential new travel restrictions, that includes vaccine and testing mandates for domestic flights. margaret. weijia jiang at the white house. the parents to have the 15-year-old boy accused of shooting and killing four fellow students in oxford at a high school in michigan this week could soon be facing criminal charges. nancy cordes has new details tonight. we hear something that sounds like someone being punched against a locker and we heard at least six more gunshots followed by screaming. drop your backpack! reporter: the senior catalina ifkovits credits her math teacher for springing into action. the shooter was right outside