Police disclose details on New Mexico mass shooter's weapons and actions.

The 18-year-old gunman who killed three elderly women in New Mexico used three weapons, including an AR-15, and had access to 10 more firearms and over 1,400 rounds of ammunition. He fired at officers before being killed in front of a church. The AR-15 was bought in November, and he purchased three magazines for it just two days before the attack. The shooter was wearing a bulletproof vest during some of the exchange but then ditched it.