Investigation into deadly shooting at Alabama Sweet 16 party

Police are searching for the shooter, or shooters, who opened fire at a Sweet 16 party in Dadeville, Alabama, over the weekend. Four people were killed and more than two dozen wounded in the attack. CBS News correspondent Omar Villafranca joins us with the latest from Dadeville, and then Tony Dokoupil and Lilia Luciano have more on rise in gun violence nationwide.