A St. Paul Public Schools administrator will not be charged for sending what police said were threatening text messages to co-workers.

Robert Jon Peterson, 42, was arrested early Thursday morning on suspicion of terroristic threats, a felony. He was released from the Ramsey County Jail Friday evening.

The Ramsey County attorney’s office said Friday they would not charge him with a crime.

“Based upon the evidence presented, there is insufficient admissible evidence that could be proven beyond a reasonable doubt to allow for a felony-level criminal charge. In the event that additional evidence is presented to us, we will review it for charging consideration,” spokesman Dennis Gerhardstein said in an email.

Prosecutors are not asking police to investigate further.

St. Paul police haven’t decided whether to ask the city attorney’s office to consider less-serious charges against Peterson.

“The investigation will remain open and active until these decisions are made,” said Sgt. Mike Ernster, a police spokesman.

After the text messages were sent, the school district Wednesday closed the 1780 W. Seventh Street building where Peterson worked and restricted access to the central administrative building at 360 Colborne St.

Police have not said what exactly was in the messages.

Peterson is executive director of the Office of College and Career Readiness and the Department of School Climate and Support. He did not return phone calls seeking comment Friday night.

As of Thursday, Peterson remained an active employee with the district.

Mara H. Gottfried contributed to this report.