>> announcer: from nbc news, this is "today" with matt lauer and savannah guthrie, live from studio 1a in rockefeller plaza. >>> and good morning. welcome to "today" on wednesday morning. i'm matt lauer. >> good morning, everyone. i'm savannah guthrie. we do have breaking news. that overnight train derailment and explosion in columbus. it happened to the southeast of the hawaii state university campus. >> it shook up a lot of people. witnesses say a huge fireball lit up the sky and a chemical smell filled the air. right now investigators aren't sure exactly what caused that crash. as we said, the area around the site has been evacuated as a precaution. we're going to have the latest on this story coming up just ahead. >>> also ahead this morning police released the frantic 911 call made after a florida teenager was attacked by an alligator. he lost one of his arms. it could have been much worse. coming up we're going to hear that call. the victim will explain why he has television to...