Two arrested after alleged threats against Pokemon World Championship

Two men were arrested in Boston after allegedly threatening violence against the Pokemon World Championship, Boston police confirmed Sunday.

Security personnel at the Hynes Convention Center flagged threatening social media posts to Boston police Thursday, which prompted an investigation at the venue. Hours later, according to police, two men were detained as they tried to enter the event.

The men, identified as Kevin Norton, 17, and James Stumbo, 27, drove from Iowa and had several weapons in their vehicle, which was seized after the pair failed to produce a license to carry firearms.

The two were released Thursday as authorities sought a search warrant for the vehicle, which they obtained Friday. Police found a 12-gauge Remington shotgun, an AR-15 rifle, several hundred rounds of ammunition and a hunting knife.

The pair were then arrested at a hotel in Saugus and will be arraigned in Boston Municipal Court on charges of unlawful possession of a firearm, unlawful possession of ammunition and other firearm-related charges, authorities said.

The FBI is assisting the Boston Police Department in the investigation, a law enforcement source tells CBS News senior investigative producer Pat Milton.

In a statement, Pokemon Company International said:

"Prior to the event this weekend, our community of players made us aware of a security issue. We gathered information and gave it as soon as possible to the authorities at the John B. Hynes Veterans Memorial Convention Center who acted swiftly and spearheaded communication with the Boston Police Department. Due to quick action, the potential threat was resolved. The Pokemon Company International takes the safety of our fans seriously and will continue to ensure proper security measures are a priority."