‘Mass casualty attack’ plot at Texas high school involving 2 teens thwarted: FBI

• The Federal Bureau of Investigation (FBI) said it thwarted a “mass casualty attack” plot involving two teens from Texas. Law enforcement said the 15- and 16-year-old girls were planning to use pipe bombs and guns in an attack at a high school in Harris County, Texas.
• The FBI threat mitigation squad reportedly moved quickly on Tuesday after learning of the plot from local authorities and located the girls within 30 minutes of the call, taking both of them into custody.
• Authorities said that the 16-year-old suspect is a student at the targeted high school and is being held on a charge of making a terroristic threat, while the other student, who is 15, is being held on an unrelated charge.

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The Federal Bureau of Investigation (FBI) said it thwarted a “mass casualty attack” plot involving two teens in Texas. Law enforcement says the 15- and 16-year-old girls were planning to use pipe bombs and guns in an attack at a high school in Harris County, Texas.

What happened to the suspects?

The FBI reportedly moved quickly on Tuesday, Feb. 18, after learning of the plot from local authorities, and found the girls within 30 minutes of the call, taking both of them into custody.

#BREAKING FBI Houston received information yesterday that two underage teenagers from the Houston area were plotting a mass casualty attack at a local school. Our Threat Mitigation Team immediately responded to help @houstonpolice & @MCTXSheriff identify and arrest them. #HouNews pic.twitter.com/FjzPJpGQ0e

— FBI Houston (@FBIHouston) February 20, 2025

Authorities said the 16-year-old suspect is a student at the targeted high school and is being held on a charge of making a terrorist threat, while the other student, who is 15, is being held on an unrelated charge.

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What have investigators uncovered?

Investigators say no firearms, bombs or bomb-making material were recovered, but noted that the investigation is still ongoing.

Why is the incident important for the bigger picture?

The incident comes after the FBI said it worked with local police in Mooresville, Indiana, to prevent a mass shooting plot at a high school after threats were posted online by the suspect.

FBI officials lauded the latest effort, saying it’s the “perfect example” of how federal, state and local law enforcement can work together to stop attacks before they happen.