About a possible second shooter. Also tonight, the growing unrest on campus. New arrests as police clash with propalestinian protesters at u. T. Austin. The massive walkout at ucla. And at columbia the school suspending protesters who refuse to clear out. The deadly Tornado Outbreak across the central u. S. At least five killed, including a fourmonthold infant. The first ef4 of the year hitting in oklahoma. And now the new severe threat. Al roker is here tracking it. The u. S. Turning up the pressure on hamas to accept israels new ceasefire offer. And the concerns among israeli officials. Could the International Criminal court issue an Arrest Warrant for Prime Minister netanyahu . Our nbc news exclusive. The Biden Administration announcing new automatic Emergency Brake Rules for new cars. How it could save pedestrian lives. Five years after the San Diego Zoo said goodbye to its giant pandas the exciting new announcement. And the amazon return with a Secret Stowaway and her more than 1,