Planned "mass casualty attack" at Houston-area high school thwarted, FBI says

Two teenagers are under arrest for allegedly plotting what the FBI is calling "a mass casualty attack" at a Houston-area high school.

Planned "mass casualty attack" at Houston-area high school thwarted, FBI says
Two teenagers are under arrest for allegedly plotting what the FBI is calling "a mass casualty attack" at a Houston-area high school.