Two men who drove from Iowa to Boston for the Pokémon World Championships were arrested Friday after seemingly threatening violence over social media against attendees of the event, according to the Boston Police Department.Kevin Norton, 18, and James Stumbo, 27, were arrested on several firearm-related charges. The official Pokémon site lists Kevin Norton and a James Stumbo, both from the U.S., as invitees in the “masters division” of the world championships of the Pokémon Trading Card Game. Private security at the Hynes Convention Center, where the Championships were taking place, were also aware of the threats and stopped the two men when they attempted to enter on Thursday. Police detectives seized their car and upon delivery of a search warrant on Friday found within a 12 gauge shotgun, an AR-15 rifle and hundreds of rounds of ammunition. They then arrested Norton and Stumbo that afternoon in Saugus, Massachusetts. The pair will be arraigned in Boston on Monday. The police released the above photo of the weapons confiscated from the car.