We appreciate your time. Thanks for joining us. Tonight, the deadly blast rocking an american city. The massive explosion, a building leveled. You could feel the blast across the city, witnesses said. At least one dead, several injured, raced from the scene. Firefighters had been called to the area right before the explosion. Also at this hour, the major snowstorm slamming several states right now. Up to two feet of snow, dangerous winds, 1,000 flights grounded or delayed. 100 miles of a key interstate shut down tonight. Rob marciano has the track and the timing as we head into this evening. Attorney general william barr on the hill, pressed on how he could determine there was no Obstruction Of Justice when Robert Mueller did not. And what he said about spying on the trump campaign. The horrific and deadly bus crash today. The Truck Barrelling through an intersection, slamming right into a school bus. That Deadly Police standoff, officers called to this home, both officers shot. And to
reporter: one final act of kindness is being remembered tonight, as this new jersey high school grieves the loss of their principal. dr. derrick nelson, just 44 years old, died unexpectedly over the weekend after recently donating bone marrow. even if you never even spoke a word with him, his impact was felt the moment you walked in as a freshman. reporter: according to the westfield high school newspaper, nelson was contacted by a bone marrow program, telling him he was a match for a 14-year-old boy in france. nelson reportedly telling the paper at the time, if it s just a little bit of pain for a little bit of time that can give someone years of joy, it s all worth it. his fiance telling abc news that he suffered complications after his donation, saying, his last kind and generous act on this earth, in giving so someone else might live, is a true testament to who he was. and david, doctors stress that complications from bone marrow donations are extremely rare. nelson is su