A 12-year-old girl was arrested overnight for making terroristic threats against Killeen schools.

Killeen ISD said the Roy J. Smith Middle School student made a series of threats on social media this week, spurring hundreds of phone calls from concerned parents and leading to an investigation that included the FBI.

“We have been pursuing and investigating threats posted via social media very aggressively the past several days,” KISD Superintendent John Craft said in a statement Wednesday. “A social media threat made towards Smith Middle School and other KISD schools was investigated yesterday and overnight into early hours of this morning. Working with KISD Police, the Killeen Police Department, federal authorities and officials at Fort Hood, a search warrant was issued. The student was arrested at her residence and has been charged with making terroristic threats.”

Dr. Craft said Killeen ISD would pursue charges to the fullest extent possible under state and federal law, and the district would also take whatever disciplinary actions allowed under the Student Code of Conduct and the Texas Education Code.

"We appreciate the cooperation and hard work of the many entities involved in assisting with this investigation and in maintaining the safety of our campuses," Dr. Craft said.