Classes will resume Friday after the investigation into the post that included threats against a student at the high school.

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A 14-year-old Hazen High School student, who police believe is behind a threatening Instagram post that canceled classes Thursday, turned himself in to authorities Thursday evening, police said.

He was released Thursday evening to his parents, police said. He and another youth were expelled, the district reported.

The police investigation into the post indicated it “was intended as a prank, and no actual violence was planned,” Renton police said in a news release.

The district canceled classes after it was alerted to the post, which included threats against a student at the school, and the school itself, said district spokesman Randy Matheson. The post also included a mention of a weapon, he said.

Detectives identified the 14-year-old “with the cooperation of social media companies” and through interviews with students, the news release says. No further details on the investigation were immediately available.

Classes will resume Friday at the high school.