An armed policeman keeps watch as mourners arrive to attend funerals for victims killed in the mosque massacre in Christchurch, New Zealand.
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Can more money prevent mass murder? Authorities look to more monitoring after shootings
Federal authorities would not have known earlier this summer that William Patrick Williams had threatened to "shoot up" a Lubbock, Texas, hotel where he was staying and had amassed weapons, ammunition and tactical gear were it not for Williams' grandmother.
