September 9, 2014 11:16 am Chula Vista School on High Alert After Threatening Tweet Eastlake High School increased security on Sept. 8, 2014, after a threatening tweet. NBC 7’s Diana Guevara reports. US & World Videos 0:28 A Vermont state trooper plunges into icy pond to rescue 8-year-old girl 2:59 Keep these travel etiquette tips in mind this holiday season 2:20 Bodies of Missing Men Found in Rubber Bins Inside Storage Unit 1:42 Hundreds of Golden Retrievers Walk a Mile for the Official Boston Marathon Dog 1:51 Typewriter Shop Owner Receives Gift From Tom Hanks