russia where the radioactive materials could be obtained makes this big business for criminal terrorist organizations. >> for a group that has billions it could potentially shut down a city. >> in 2014 several people were arrested for smuggling the materials. the sting operation shows a more dangerous vulnerability. >> if isis were to acquire radioactive material then they could use it in the region the theater or other purposes if they wanted to transport it and bring it here to the united states. >> and officials i have spoken with say it would be very difficult to transport these radiation materials from eastern europe because of the protection placements at the borders. but one official said if isis wanted to build a dirty bomb today it could because it