This is the second major shooting in the US this weekend after as many as 20 people were killed when a man opened fire at a Walmart store in El Paso, Texas on Saturday.
Bookstore owners were cautioned against keeping or distributing the books. Police personnel briefed the bookstore owners about the legal consequences of violating the ban.
Shocked family members demanded justice for Castile, a school cafeteria worker, whose mother described him as a law-abiding citizen who kept out of trouble.