Federal officials investigating the deadly Buffalo grocery store shooting are trying to find out if a retired federal agent from Texas, who reportedly talked to the alleged shooter online frequently, was one of a handful of people who knew about the shooting about 30 minutes before the attack was carried out.  Payton Gendron, 18, invited around 30 people in a chatroom devoted to racism to read his White supremacist ramblings and then showed them his plans less than an hour before he went to Tops Supermarket and allegedly killed 10 Black people, according to The Buffalo News. 

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