. >> reporter: mary millen has been working at amilee arena for 16 years. she says reinterrorist attacks have more peep bringing guns, which are not allowed, even for off had duty law enforcement. >> reporter: since paris, you've been seeing an increase? >> absolutely. >> reporter: when the circus was at amilee, more than a dozen guns were spotted. an additional 12 guns were lightning games since september. >> since paris, people krrnd for their safety. you're seeing more and more of the population looking for ways to protect themselves personally. >> reporter: since september, security confiscated more than 500 knives. >> we're seeing a plethora of knives. knives in every shape, capacity. >> reporter: including clandestine knives like this, you. >> it fits in your wallet like a credit card. >> reporter: but when the plastic is folded, it becomes a knife. screeners have also gotten more than 200 containers of pepper spray. >> we're seeing what he call tin cats or brass news. >> reporter: since the pare attack, mary beefed up security building. more bags are