announcer: this is nbc nightly news with lester holt reporting tonight from buffalo, new york. good evening from buffalo. a still proud but deeply wounded community asking tonight, why us. why a teenager traveled hundreds of miles to this city, to this block, to this grocery store to allegedly seek out black people to kill today we learn the gun attack that killed ten and injured three may not have gone entirely as planned police believe the shooter, pumped up on false and racist conspiracy theories, intended to head down the street and shoot more people. thankfully he was stopped and arrested it came on the same weekend as a mass shooting at a southern california church, an attack on taiwanese church members being investigated tonight as a hate crime that was politically motivated. we ll have more on that in a few moments. let s begin here with the pain, remembrances, and fear in buffalo tonight, buffalo still struggling to come to terms with how someone could turn a s
church in charleston in 2015. the shooter in buffalo etched references to previous shootings on his weapons. in a racist rant, he claimed he wa radicalized on 4chan and repeatedly cites the false unfounded great replacement theory, suggesting jewish elites are bringing people of color to replace whites scott white with the anti-defamation league says it is easy to find on social media sites that don t have moderation policies. talking about discord, talking about gab and parler, and telegram, site that are frequented by extremists. and they don t have rules what can be said. people can put whatever they want on there. reporter: the fbi is seeing racially motivated extremism incidents, fed by social media and also gaming platforms the buffalo shooter live streamed his attack on twitch before it was taken down, but the video is still circulating. outrage for garnel whitfield, who lost his mother ruth on saturday our matriarch, our hero, our angel wa