An employee of a private school in Southeast Washington fought off an intruder who tried to sexually assault her Thursday morning, according to D.C. police.

The attack occurred about 6:40 a.m. in the Naylor Road School, in the 2400 block of Naylor Road SE. Authorities said that a man grabbed the woman but that she managed to escape and the man ran away.

Police did not say where in the school the attack occurred or if any students were in the building. The school has more than 160 pupils in preschool through eighth grade. School officials could not be reached Saturday to comment.

In a statement, D.C. police said the attack occurred in the 2300 block of R Street SE, around the corner from the school. A police spokesman said he was unsure why that address was used but confirmed that the attack occurred inside the school building.

Police described the attacker as a black male with a dark complexion, about 25 to 35 years old, standing 6-foot-2 and having a stocky build. Police said he had a full beard and was wearing a navy blue hooded sweatshirt and gray pants.

Anyone with information is urged to call D.C. police at 202-727-9099 or text-message the department’s tip line at 50411.

D.C. police also said they arrested a Prince George’s County man in another attempted sexual assault inside a school building in Southeast, also on Thursday morning. A police spokesman said detectives do not believe that the cases are related.

Police said the second attack occurred about 9:30 a.m. inside the Harris Educational Center, in the 4600 block of Livingston Road SE. The center is in the Washington Highlands neighborhood, about five miles south of the Naylor Road School.

In that attack, police said, a man approached an employee and tried to sexually assault her. She screamed and broke away after a brief struggle. The woman called police, who stopped a man nearby.

Jamal Coleman, 20, of Fort Washington was charged with assault with intent to commit first-degree sexual assault.