Two Butler County school districts operated on lockdown procedures Wednesday, March 29, following a morning threat of an active shooter at two schools in Allegheny County.

State police said later in the morning that the threats were not credible.

Butler Area School District operated under a “perimeter lockdown” when the threat was received out of an abundance of caution, according to superintendent Brian White. Additionally, Freeport Area School District operated on a “modified lockdown,” where no one could enter or exit the buildings.

According to Pittsburgh Public Safety’s Twitter, police responded around 11 a.m. Wednesday, March 29, to reports of a shooter at two schools in the Oakland neighborhood.

Students and parents from Central and Oakland Catholic Schools were instructed to gather at the Oakland Quad Cathedral of Learning while police investigated the calls.

Both schools later were declared safe, and no injuries were reported, but school communities in Butler County were warned of safety procedures that were implemented in initial response.

Butler County state police said in an afternoon statement Allegheny County threats still are being investigated, but were “found to have no merit.”

“Troop D takes these types of incidents very seriously, the source of these calls is currently being investigated,” the statement said.

Neither Butler County school district was mentioned in the threats, and students in both districts attended class as usual. White said dismissal and after-school activities were planned to continue as usual.

“Students are still moving within schools; just no one is coming in to campuses,” White said. “We sent a letter to parents; we will proceed with dismissal, and we are going to continue with after-school activities today.”

A letter from Freeport Area School District sent in the morning said the schools would continue on the district’s modified lockdown schedule until the threat was cleared by authorities.

Superintendent of Mars Area School District Mark Gross also said school staff had been alerted of the incidents and were instructed to be extra attentive.

“Mars Area School District is aware of multiple false reports of active shooting incidents at various schools within the Pittsburgh region and across the nation this morning,” he said. ”Please know that we have been in contact with the Adams Township Police Department as well as the Pennsylvania State Police in order to confirm that these various reports are not factual.

“Out of an abundance of caution, we are ensuring that all staff members are aware of the current situation and request that they have a heightened sense of security by actively monitoring for any suspicious activity.”

A letter from Seneca Valley School District also told parents that the schools’ staff and students were safe, and the director of safety and security was in constant communication with school security, resource officers and local police departments.

“Any and all threats and potential threats to the safety and security of our school community are taken seriously,” the letter said.

None of the districts were included in the incidents being investigated in Pittsburgh.

Shortly before noon, public safety tweeted that Pittsburgh students were returning to their homerooms.

"Police will remain in place to ensure their safety. There was NO evidence of an active shooter,“ the tweet said.

Nearby schools such as Carnegie Mellon University, the University of Pittsburgh and the Forest Hills School District were on temporary lockdown while officials investigated. Those precautionary measures have been lifted, according to Pittsburgh media outlets.

At a 12:15 p.m. news conference conducted by Pittsburgh law enforcement officials, stated schools in New Castle and the Laurel Highlands also received threats police determined to be a hoax.

Some of the school districts notified parents that they had resources available for speaking to children about threats of violence.

“The National Association of School Psychologists provides resources that may be helpful when talking to your children about difficult events, such as the possibility of school violence,” White said in an afternoon letter.