https://www.dailymail.com/news/article-15766553/White-House-shooter-Cole-Allen-suspect-motive-revealed.html
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Allen's family members told law enforcement that he had sent them some of his disturbing writings before the attack, which prompted his brother to alert police. The writings did not specifically mention the dinner on Saturday, CBS News reported.
Allen's brother notified the New London Police Department in Connecticut of the manifesto minutes before the attack, a White House official confirmed to CNN..."
