Kevin Chavez, 19, of Bridgehampton, was charged with third-degree falsely...

Kevin Chavez, 19, of Bridgehampton, was charged with third-degree falsely reporting an incident. Credit: Southampton Village Police

A Southampton High School homecoming after-party was placed on lockdown Saturday night, and a Bridgehampton man was arrested after a threatening social media post by him showed him holding what appeared to be an assault rifle, which turned out to be an air gun, Southampton Village Police said.

An unidentified student at the after-party notified school security of a Snapchat post featuring three males in a vehicle posing with what appeared to be an AR-15 assault rifle with the caption “pull up to after homecoming SH.” Security reported the post to Southampton Village Police who arrived at the Narrow Lane school shortly after 9:30 p.m. and placed the building on lockdown, meaning no one could enter or leave until the threat was assessed.

More than 20 officers, including state troopers and Southampton Village Police officers equipped with AR-15 rifles and two K-9 units assisted in securing the campus and closing Narrow Lane.

The approximately 110 students at the after-party were released to their families, and the building and street reopened about 11 p.m., police said.

Police discovered the replica gun, a Sig Sauer air rifle, at a home on Three Mile Harbor Road in East Hampton.

Kevin Chavez, 19, of Bridgehampton, was arrested shortly before midnight at a Oak View Highway home in East Hampton and charged with third-degree falsely reporting an incident, a misdemeanor. He was released on a desk appearance ticket and then taken to Stony Brook University Hospital for a psychological evaluation.

"We appreciate the response of our local police department and thank all parents for their patience during the dance dismissal process," Southampton High School principal Brian Zahn said in a statement.

Chavez is not a student at the school, although it is not clear if he was ever enrolled in the district, a district spokeswoman said. District officials could not be reached for questions.

The police did not identify the others in the photo.

The investigation is ongoing, and anyone with additional information is urged to call the Southampton Village Police Department at 631-283-0056.

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