By LEE FERRAN and SHUSHANNAH WALSHE
Law enforcement officials said that Adam Lanza was armed with four firearms when he started his rampage at a Connecticut elementary school Friday that ended in the deaths of 20 children and seven adults, but nearly all the killing was done with just one of the guns: a .223 caliber Bushmaster semiautomatic rifle.
Lanza used the rifle, a modified civilian version of the military’s M-16 similar to the popular AR-15, as he stalked through the school and opened fire on children as young as five. Dr. H. Wayne Carver, the medical examiner who investigated the massacre, told reporters over the weekend that all of Lanza’s victims had been shot more than once.
The killing ended when Lanza took his own life, this time using a handgun, officials said.