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.

Evidence suggests their intent was to carry out acts of violence at a school in the Spring Branch Independent School District, law enforcement said.

Two teenagers were arrested in Houston on suspicion of plotting an attack at a local school, the FBI Houston office said in a post on X Wednesday, the second potential mass attack thwarted by the FBI in the past week.