"This is an emergency message from Sidwell Friends School. Due to a suspicious phone call, the buildings on the Wisconsin Avenue campus have been evacuated. We will notify you when further information is available," said the school's emergency alert system earlier in the day, which was reported by the Washingtonian magazine.
The Secret Service and the local police said there was evidence it at any times threatened daughters of the First Family.
14-year-old Malia and 11-year-old Sasha Obama are students at Sidwell Friends school in Washington DC.