Meet the dogs who just finished the ATF's canine training program. ATF dogs have supported major events like the Super Bowl and are also used in the bread-and-butter of ATF's work: solving gun crimes.

The more than 68,000 illegally trafficked firearms represents 54% of such weapons in the U.S. between 2017 and 2021, Justice Department officials said.

In 2018, the federal government banned bump stocks for that reason, but gun enthusiasts have challenged the regulation in court, contending that only Congress has the power to enact such a ban.

The regulation was enacted at the behest of President Trump after the shooting at a Las Vegas concert killed 60 people and injured 400 — in 11 minutes.

The Bureau of Alcohol, Tobacco, Firearms and Explosives released a major report that details how stolen guns and emerging technology like "ghost guns" play a factor in gun violence in the U.S.

Over six months, the Atlanta-based group bought hundreds of firearms from local retailers only to resell them to Philadelphia-based brokers. Now the weapons are showing up at crime scenes.