By LEE FERRAN and SHUSHANNAH WALSHE

A Bushmaster AR-15 semi-automatic rifle and ammunition is seen in Seattle, March 27, 2006. (Ted S. Warren/AP Photo)
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.
Bushmaster, headquartered in North Carolina, bills itself on its website as the leading supplier of AR-15-type rifles in the U.S. and offers more than a dozen different models in various calibers.
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