Police in Boston have arrested two men for threatening to carry out a mass shooting at the Pokemon World Championships.

The Boston Police Department says they were notified of the social media threats made by Kevin Norton, 18, and James Stumbo, 27, on Thursday.

Stumbo had posted a photo of a 12-gauge shotgun and an AR-15 rifle on the back of a white car on Facebook earlier in the week.

"Kevin Norton and I are ready for Worlds. Boston here were come!!!" Stumbo wrote in the Facebook post.

Norton added a comment about "killing the competition" at the event, which attracts thousands of attendees.

Authorities were able to stop the two suspects as they attempted to enter the John B. Hynes Convention Center a few hours later.

When detectives searched the pair's car, they found the shotgun and rifle, as well as several hundred rounds of ammunition and a hunting knife.

Both men were later arrested and are charged with unlawful possession of a firearm, unlawful possession of ammunition and other firearm-related offenses.

The pair is set to be arraigned at Boston Municipal Court.

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