The Bureau of Alcohol, Tobacco, Firearms and Explosives for D.C. said Thursday it seized six firearms from a student after its agents saw an “alarming social media post” that made a potential threat to a local school.

The ATF confirmed with WTOP it collaborated with the Metro Transit Police Department to execute a search warrant Wednesday at the residence where the student lived. The teen was placed under arrest and officials seized six weapons and over 50 bullets.

In a post on X, Metro General Manager Randy Clarke said the officers’ “quick work prevented a very serious threat to our community.”

Attorney General Pam Bondi said, “This is the kind of incredible police work that saves lives.”

No information about the juvenile or the school where the threat was made has been released.

An investigation is ongoing in this case.