Illegal, dangerous, and potentially deadly new devices have been found in recent crimes. The device brings a new concern for local law enforcement and across the country.

Police said an "auto-sear" is a device that allows semi-automatic handguns to become fully automatic. Officers found two "auto-sears" inside the residence. Officers took a 17-year-old boy into ...

"The search yielded an extensive collection of weapons, including multiple 3D-printed "ghost guns" without serial numbers, semi-automatic rifles, handguns, shotguns, an AK-47 semi-automatic rifle ...

an AK-47 semi-automatic rifle and more. Investigators also found large-capacity magazines, 18 suppressors, 74 auto sears or devices that convert semi-automatic firearms to fully automatic firearms.

The auto-sear turns a semi-automatic gun into an automatic weapon. During a demonstration by the ATF, one pull of the trigger fired off 30 rounds in 2.19 seconds. Even for veteran law enforcement ...