"It takes just one gun purchased through the dark web to kill someone and the danger is very real..."

Laws that focus on who has guns—rather than gun type—may do more to lower gun-related deaths.

Live streaming is a tool terrorists use to spread messages of fear, whether they're radical right-wing extremists or members of ISIS, an expert says.

"This pattern held true even for physician groups that publicly endorsed evidence-based policies to reduce firearm injury."

Years lost from fatal gun injuries differ by race, research finds, which suggests interventions need to vary, as well.

Since 1999, about 4 of every 100,000 US children and teens have died by a gun-related homicide, suicide, or unintended shooting each year.

"As a physician and a researcher, I know that it doesn't have to be this way."