'Seriously emotionally disturbed' person carried out attack, says fmr. NYPD head

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UP NEXT
Kornacki: Pennsylvania recount seems all but certain at this point
06:57
McFaul: Putin has failed on his major objectives in Ukraine
11:13
'Hold onto your hats': Why the stock market could be volatile this summer
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U.S. Soccer president celebrates 'historic' equal pay announcement
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NBC News justice correspondent Pete Williams set to retire
01:59
'I miss my hometown; I miss my friends': Writer reflects on leaving Russia
06:33