A police investigation is underway at Ballou High School today after a D.C. police officer and a security guard were sprayed with mace by a young person. WUSA9 reported this afternoon that a police officer had recognized a juvenile inside the school from an outstanding arrest warrant in Virginia — at some point after that, the suspect produced mace and sprayed both the officer and a security guard near a secondary exit and fled the school, which is located at 3401 4th Street SE. Several police cars have been stationed outside the building this morning after the incident, which took place just before 10 a.m. Police are reportedly pursuing aggravated assault charges.