Guns Used In San Bernardino Similar To Those Used In Sandy Hook, Aurora, Umpqua

03:41

December 04, 2015

In this Aug. 15, 2012 photo, three variations of the AR-15 assault rifle are displayed at the California Department of Justice in Sacramento, Calif. In the wake of the school shootings at the Sandy Hook Elementary School in Newton Connecticut, California State Sen. President Pro Tem Darrell Steinberg said Wednesday, Jan. 16, 2013, that he expects the Democratic-controlled Legislature to strengthen gun control this year.(Rich Pedroncelli/AP)

A federal source today confirmed to NPR that the female shooter in San Bernardino pledged support for the leader of ISIS on social media around the time of Wednesday's rampage, though there is still no evidence that she and her husband were actually members of, or directed by, ISIS.

Investigators still don't know the motive for the attacks, but one thing they do know is that the shooters had four weapons: two handguns and two AR-15 rifles. All had been purchased legally in California.

Here & Now's Jeremy Hobson talks with Alex Yablon, a reporter with the nonprofit reporting website The Trace, which is dedicated to expanding coverage of gun issues in the U.S., about the weapons that were used in this week's shooting, and how they compare to weapons used in other recent mass shootings.

The Trace: How the San Bernardino Shooters' AR-15s Broke California Laws

Guest

Alex Yablon, reporter at The Trace. He tweets @AlexYablon.

This segment aired on December 4, 2015.