Shooters used untraceable dum-dum bullets

A chief surgeon treating the wounded from Friday's mass shooting, meanwhile, said he believes the attacker used special "dum-dum" bullets that cause massive internal injuries. The doctor told The Associated Press that the killer's chosen ammo "exploded inside the body."

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"These bullets more or less exploded inside the body," Poole said. "It's caused us all kinds of extra problems in dealing with the wounds they cause, with very strange trajectories."

Ballistics experts say the so-called "dum-dum" bullets also are lighter in weight and can be fired with greater accuracy over varying distances. They commonly are used by air marshals and hunters of small animals. Such characteristics potentially would have allowed the gunman to carry more ammunition and fire his weapons at varying targets without adjusting his sights.
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