India, Jan. 12 -- Several campuses within Frisco ISD on Monday received threatening emails, as stated in a letter addressed to parents and staff.

In the letter, Frisco ISD informed that administrators promptly alerted the Frisco Police Department and initiated safety protocols, placing all campuses in a "secure status" while the investigation is ongoing, CBS News reported.

School officials stated that they currently consider the threat to be "non-credible."

Amid the investigation, the district has urged parents to refrain from sending their children to campus, and any students who have not yet arrived are advised to remain at home.

Students already present on campus will stay there until law enforcement provides guidance that allows t...