A 15-year-old Florida boy was arrested after posting a message on Instagram threatening to kill people at several Broward County schools, authorities said.

Just after midnight Friday, Broward Sheriff's Office detectives were notified about the online post from a Fort Lauderdale teen. He posted it one day after 17 people were killed during a mass shooting at Marjory Stoneman Douglas High School in Parkland.

The teen told detectives that the post was a joke aimed to scare his cousin and he appeared remorseful, according to a sheriff's news release.

The juvenile is facing one count of sending a written threat to kill, which is a third-degree felony.

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A sign announcing a home for sale is posted outside a home Feb. 1, 2024, in Acworth. Metro Atlanta saw a 4% decrease in April home sales compared to April 2024. (Mike Stewart/AP 2024)

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