Two teenage girls arrested Wednesday are accused of plotting "a mass casualty attack" at Memorial High School in Spring Branch ISD, according to authorities. The Spring Branch ISD police department was initially notified by the FBI of a potentially credible threat against the school on Tuesday and arrested the student involved,

A plan to harm students at Memorial High School using guns and pipe bombs has led to the arrest of two teenage girls. This story, exclusively covered by KPRC 2, reveals that the girls are now in custody, and Spring Branch ISD police assure that there is no longer a threat to the school or its students.

The two girls, ages 15 and 16, planned on placing pipe bombs around the school and using guns to then pick off panicking students and teachers, the Montgomery County Sheriff’s Office alleged.