How Indiana gun laws failed to prevent a mass shooting last week. And conflicting views on Brexit spur violence in Northern Ireland.Read more:Police say existing gun laws should have prevented a mass shooting in Indiana last week. Instead, the shooter was able to legally purchase firearms. Paulina Firozi reports. In Northern Ireland, Protestant unionists and Catholic nationalists have faced off in riots fueled by anger over Brexit trade deals. Amanda Ferguson reports from Belfast on some of the worst violence in Northern Ireland in more than a decade.If you value the journalism you hear in this podcast, please subscribe to The Washington Post. We have a deal for our listeners: one year of unlimited access to everything The Post publishes for just $29. To sign up, go to postreports.com/offer.