PITTSBURGH (KDKA) – Police say they know who made the phone threats that caused three Pittsburgh Public Schools to evacuate earlier this month.

Police say it was a juvenile male, but did not specify if he was a student at West Liberty, South Brook or Pioneer – all of which had students evacuated to Brashear High School or sent home.

The evacuations took place after a voicemail threat was discovered at Pittsburgh West Liberty shortly before the start of school Sept. 17.

The nature of that threat was not disclosed.

“Everyone can rest assured that there is no cause for concern. There has been no credible threat against the schools,” said Acting Police Chief Cameron McLay. “Since the first threat was received, five detectives have worked 16-hour days to ensure the safety of the public, the school students, and the school employees, and to identify the person responsible for the threats. We have succeeded in doing just that.”

Pittsburgh Police plan to hold a press conference next week regarding the threats.

No charges have been filed yet.

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