A group supporting tougher gun laws planned a protest outside the headquarters of the gun industry's national trade association in Newtown, where 20 first-graders and six adults were killed at a school more than a year ago.

The Newtown Action Alliance says its members intended to gather Monday morning outside the National Shooting Sports Foundation. The alliance says it's protesting the gun industry's record of selling assault rifles used in mass shootings while opposing efforts to prevent gun violence.

The rally comes a day before the foundation's annual trade show and conference opens in Las Vegas. The foundation represents more than 9,500 federally licensed firearms manufacturers, distributors and retailers.

The foundation says the alliance's characterization of the gun industry is wrong, and the foundation is committed to improving public safety.