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.
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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.
