The private academy where the Obama daughters go to school was evacuated Thursday, though the school says students and employees have since returned to class.
Sidwell Friends School, the Washington school attended by Sasha and Malia Obama, was evacuated after what the school described as "a suspicious phone call."
"After an investigation by law enforcement, it was determined that no risk was present. Students and employees have now returned to class," the school said in a brief statement on its website.
The Secret Service said it was monitoring the situation.