Transcripts for KGO ABC World News Tonight With David Muir 2

mission still being fought today. good evening. and welcome to "world news tonight." and we have come here to memphis, where 50 years ago, this very hour, the reverend dr. martin luther king jr. was killed by an assassin's bullet. as he stood on the balcony of the lorraine hotel. it happened in front of room 306. there have beenolemn tributes all day long. we'll have much more of the tributes later in the broadcast. but we begin right now with new details of that troubling attack at youtube headquarters in california. the gunwoman's strange youtube videos. her visit to a shooting range just before the attack. abc's seen yonior national correspondent matt gutman is on the scene tonight. >> reporter: tonight, investigators revealing nasim aghdam broadcast her motive right on her very target's website. >> i'm being discriminated and filtered on youtube. >> reporter: aghdam racked up

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