A cache of firearms and other weapons was found in the home of a Pine Tree High School senior who was arrested this week on a charge of making a terroristic threat against the school, investigative documents show. The documents also suggest there were “three other people involved” in a mass shooting plan.

Investigators executing a search warrant this week at the home of Christopher Andrew Jones, 17, found 17 firearms, brass knuckles and a pair of 26-inch swords.

The documents indicate Jones, posting in an online chat room under the screen name “Drejsaeca,” made statements about carrying out a shooting at the high school to an online chatter in California, who contacted authorities.