Violence in Mexico after arrest of alleged drug kingpin

The arrest of alleged drug trafficker and senior Mexican cartel member Ovidio Guzman sparked an outburst of violence in Mexico last week, shutting down roads and airports. Matt Galloway talks to Mexico-based journalist Ioan Grillo, author of the El Narco trilogy; Canada-based journalist Luis Horacio Nájera, co-author of The Wolfpack: The Millennial Mobsters Who Brought Chaos and the Cartels to the Canadian Underworld.