An 18-year-old man has been charged in the US with threatening to shoot a boy for sharing information about a subplot of the new Star Wars movie during an online conversation.
Arthur Charles Roy, from Helena, was charged with felony assault with a weapon on Monday during an appearance in Lewis and Clark County Justice Court.
He remains in jail with his bail set at $US10,000 ($A13,900).
Prosecutors allege Roy became angry on Thursday when he learned details about Star Wars: The Force Awakens from a Facebook friend.
Court records said he sent the friend a picture of himself with a gun and threatened to come to the victim's school to shoot him.
Helena's alternative high school was locked down on Friday morning. Police arrested Roy on Friday afternoon.
It's unclear whether Roy has obtained a lawyer.
A public defender is representing him in an ongoing separate case.
