Stone Bridge High School sign

A sign bearing the school's name stands at the entrance to Stone Bridge High School in Ashburn.

Stone Bridge High School in Ashburn was placed in "secure the building" mode Thursday afternoon, after a threat was placed against the school by phone, according to a statement by principal Tim Flynn.

The school was taken out of secure mode at an unspecified time later on Thursday. Flynn said in a follow-up statement that the Loudoun County Sheriff's Office told administrators the threat had been mitigated, and extra security was no longer needed.

Deputies from the LCSO and personnel from Loudoun County Public Schools' Safety and Security unit were investigating the source of the threat, according to Flynn's first statement. A spokesperson for the sheriff's office said the school received the phone call at around 1 p.m.

Stone Bridge officials restricted entrance to the school and cancelled outdoor activities until the situation was resolved, Flynn said. Students and staff were safe and accounted for shortly after the threat was placed.

When the threat situation was mitigated, Flynn said he anticipated "a normal dismissal day. After-school activities will be held as usual."

The sheriff's office continues its investigation into the matter, an LCSO spokesperson said.

The lockdown comes a little more than a week after an Alexandria man was arrested for allegedly using threatening language in call to Stone Bridge High School on Tuesday, November 30th.

In that case, 31-year-old Robert M. Ruiz of Alexandria was served with a misdemeanor warrant with help from the Fairfax County Police Department, according to the Loudoun County Sheriff's Office.

Additionally, the Thursday lockdown at Stone Bridge comes a day after the Sheriff's office announced the arrest of an 18-year-old Fairfax man who allegedly posted threats on social media Tuesday, which were directed at Farmwell Station Middle School in Ashburn.

In that case, Shane D. Lucas of Fairfax was charged with threats of bodily injury or death to persons on school property — a Class 6 felony, the sheriff’s office said in a press release.with threats of bodily injury or death to persons on school property — a Class 6 felony, the sheriff’s office said in a press release.

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