NBC Nightly News Full Episode - Aug. 18

Tonight: A fiery Toledo chemical plant explosion kills at least two employees. Plus, a 'bag of medication' a police report says found where actress Hayden Panettiere died. Her mom speaking out in an exclusive call with NBC News. And, two Dan Sullivans vie for Alaska Senate seat in an unusual primary, with races in Florida and Wyoming tonight, too. The trial in the killing of Tupac Shakur is underway, with new images shown in day two of testimony. All that and more on tonight's broadcast.

0:00 Introduction 1:38 Deadly explosion flattens Ohio plant 4:35 Hayden Panettiere's mother speaks out 7:07 Tupac Shakur trial: new images of murder shown 8:56 Critical primary elections in Alaska, Florida 10:58 Brooklyn woman missing as mysterious texts pour in 12:41 Babysitter accused of kidnapping sisters 14:35 Search for suspect in horror movie mask

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