The official was not authorized to discuss details of the investigation publicly and spoke to The AP on condition of anonymity.
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‘Time-to-crime,’ the average time between the purchase of a gun and its recovery from a crime scene, is used to gauge levels of criminal intent in the purchase of firearms, as well as to deduce where hubs of gun trafficking are located.
Police say a former student shot through the doors of a Christian elementary school and killed three children after planning the massacre by drawing out a detailed map.