Police: Teenage girls planned shooting and pipe bomb attack at Memorial High School in Spring Branch ISD

Police are investigating after two students were accused of threatening to place pipe bombs in a Houston high school and shoot peers, according to police. The two teenage girls were in custody.

According to authorities, one of the suspects, a Willis High School student, is currently being held on unrelated charges, while the second suspect, identified as a girl from Spring Branch ISD, is in custody in Harris County. Evidence suggests the girls intended to place pipe bombs and shoot students at Memorial High School, according to Spring Branch ISD police.

Spring Branch ISD police said one of the teens was 15 years old and the other was 16 years old. The 16-year-old suspect was charged with making a terroristic threat. The plan, shared through social media, was very detailed and that led investigators to believe it was credible, police said.

A letter sent to students, families and staff said the Spring Branch ISD police quickly arrested a student in the “potentially credible threat.”

FBI Houston said it was also involved in the investigation, saying the teens were planning a “mass casualty attack.”

Read more: KHOU