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A South Pasadena High School student was detained Friday after making a social media threat about gun violence on campus, police said.

South Pasadena High School was placed on lockdown Friday, March 10, 2017 after a social media posting. (Credit: Jay L. Clendenin / Los Angeles Times)

The 17-year-old boy turned himself in to the South Pasadena Police Department and was taken into custody, Sgt. Spencer Louie said. The boy’s identity was not released because he is a minor.

An investigation was launched Friday morning after someone had taken a snapshot of the threatening post and shown it to police, officials said.

After officers determined the post was created by a student, they went to his home, but he wasn’t there, police said. They eventually managed to reach him by phone.

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