A landmark U.S. Supreme Court decision on the Second Amendment is upending gun laws across the country, dividing judges and sowing confusion over what firearm restrictions can remain on the books.

By Alanna Durkin Richer, Lindsay Whitehurst, Associated Press

As negotiations on gun legislation continued on Capitol Hill, lawmakers on the House Oversight Committee heard wrenching testimony from those affected by recent mass shootings. Democrats on the committee cited these witnesses as motivation to push for stricter gun laws.

By William Brangham, Lizz Bolaji, Alexis Cox

The number of schools that have now dealt with a shooting or a mass shooting keeps growing. And because of that there's a group of school principals known as the Principal Recovery Network. They have dealt with these events and…

Gun violence ripped through multiple communities last weekend, with dozens killed or injured in shootings nationwide. A growing number of health care providers say gun violence is a public health issue. Dr. Joseph Sakran, a trauma surgeon at Johns Hopkins…