Six people shot outside mall in Indianapolis

Authorities say someone who was involved in a fight between two groups of youths outside a downtown Indianapolis shopping mall overnight opened fire and wounded six people before he fled the scene.   

Is it possible to round up 16 million AR-15s and AK-47s?

Democratic presidential candidate Beto O'Rourke's recent vow to take away people's AR-15 and AK-47 rifles raised one big question: How is it possible to round up the millions of such guns that exist in the United States?   

Mass shooters exploited gaps, errors in US background checks

Most mass shooters in the U.S. acquired the weapons they used legally because there was nothing in their background to disqualify them, according to James Alan Fox, a criminologist with Northeastern University who has studied mass shootings for decades.