PORTSMOUTH, N.H. — A Maine man charged with using social media to threaten to commit a shooting at a New Hampshire high school has changed his plea to guilty, court documents state.

Police charged Kyle Hendrickson with criminal threatening with a firearm in April. They said he posted a video with a gun outside Portsmouth High School in which he threatened to “shoot up the school.”

A federal grand jury subsequently indicted Hendrickson in September on charges of interstate threatening communications and possessing a firearm in a school zone. Hendrickson now intends to plead guilty to those charges and is due in court on Dec. 11, court records state.

Portsmouth closed all schools for a day when the threat occurred.

Hendrickson has been represented by attorney Murdoch Walker II. Walker did not return a phone call seeking comment.

On the latest episode of "Sarra Sounds Off," Gregg stops by Kings Park to check out their pitching staff and Jared Valluzzi has the plays of the week. Credit: Newsday

Sarra Sounds Off, Ep. 30: Baseball, All-Long Island and Plays of the Week! On the latest episode of "Sarra Sounds Off," Gregg stops by Kings Park to check out their pitching staff and Jared Valluzzi has the plays of the week.

On the latest episode of "Sarra Sounds Off," Gregg stops by Kings Park to check out their pitching staff and Jared Valluzzi has the plays of the week. Credit: Newsday

Sarra Sounds Off, Ep. 30: Baseball, All-Long Island and Plays of the Week! On the latest episode of "Sarra Sounds Off," Gregg stops by Kings Park to check out their pitching staff and Jared Valluzzi has the plays of the week.

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