This isn't the first time the NRA has held its convention days after a nearby mass shooting. Some politicians and musicians are dropping out, and gun control advocates are preparing protests.

New York is the latest, and largest, state to consider charging product-makers to dispose of their packaging. But lawmakers are clashing over how much to involve industry in creating a new system.

Law enforcement is still investigating the shooting at Robb Elementary School. But accounts from officials have offered a confusing look at the timeline of Tuesday's shooting.

Mass shootings have become so common in the U.S. that one group has created a mass shooting protocol checklist to guide mayors and city officials during the first 24 hours after a tragedy occurs.