The Tennessee Bureau of Investigation (TBI) announced Wednesday that it was investigating a series of hoax phone calls made to schools around the state alerting them to potential school shootings.

“DEVELOPING: TBI is currently working with state and federal partners to determine the source of several hoax calls, placed to local law enforcement agencies, reporting an active shooter at several high schools in the state,” TBI said Wednesday on Twitter.

“At this time, none of these reports has proven credible and there is no known immediate threat to public safety at this time,” TBI said in a follow-up tweet.

The organization later said that multiple other law enforcement entities are also investigating.

“Local, state, and federal authorities continue to jointly investigate the source of the recent hoax calls. Those efforts show Tennessee is one of many states impacted by this,” TBI said. “State authorities continue to investigate the situation and work with law enforcement counterparts nationwide to identify and hold accountable the person/s responsible for the calls.”

Tennessee remains on edge after 28-year-old Audrey Elizabeth Hale, who identified as transgender, shot and killed six people at The Covenant School in Nashville in late March.

In the time since the shooting, the Metro Nashville Police Department (MNPD), along with the Federal Bureau of Investigation (FBI), has promised the release of Hale’s manifesto (which they later said was a collection of “dated journals”) as the public eagerly awaits information on the mass killer’s motive.

Multiple lawsuits demanding the release of the manifesto have been filed.

Thursday, The Tennessee Star reported that those hearings in those lawsuits have been pushed to a later date, adding to what is becoming a tense showdown between law enforcement and the public.

According to The Star:

The judge hearing lawsuits demanding the Metropolitan Nashville Police Department release the Covenant School killer’s manifesto has pushed back a show cause hearing on the litigation as MNPD attempts to maneuver around Tennessee’s public record laws.

It appears the police department and its attorneys are going to try to bury the plaintiffs — and the court — in paper.

Tennessee 20th Judicial District Chancery Court Judge I’Ashea Myles originally had ordered a show cause hearing for May 11 to examine whether the MNPD has failed to comply with public records laws.

At a hearing Wednesday afternoon with plaintiffs’ representatives and MNPD legal counsel, Myles scheduled a status conference hearing for 1 p.m. May 18, and extended the show cause hearing to June 8, also at 1 p.m., according to an attorney who attended the hearing.

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Pete D’Abrosca is a reporter at The Tennessee Star and The Star News Network. Follow Pete on Twitter.