traces back to the last legal purchaser. i know that you ve dealt with other similar situations like it across the nation, especially the a it rks f in general, can you kind of describe how these shooters went about business. they seem to be very professional. they knew what they were doing. they seemed to have things well-planned. yes. with my experiences with other mass shootings or we reference the boston bomber earlier, there are indicators that this was well-planned out. and it was to be violent in nature. they were in tactical gear. i don t know if they had ballistic protection, but they were in tactical gear, and had several magazines full of ammunition fastened to their body. so they were ready for a gunfight, should that occur. that was the meredith davis speaking with nbc station a short while ago. joining us now, nbc news investigative reporter and former los angeles times reporter. andrew, what is your reaction to that press conference where,