Flash Mob Type Mentality News Today

Joining me now is msnbc terrorism analyst, malcolm nance. we heard theres no credible threat, but what is the biggest challenge for security teams at an event like this? these are scary times. >> unfortunately, a credible threat means they have some intelligence indicators there may be a plot in the offing. what we have seen with isis and al qaeda is they carry out inspirational attacks. which means that they inspire individuals to go out and do it on their own. isis is a flash mob type mentalit...