A teacher at a Leesburg preschool accused of sexually assaulting a 4-year-old student faces additional charges in connection to a second assault on a different child, according to the Leesburg Police Department.

Brad R. Minor, 23, of Leesburg, was first charged Tuesday with one count of forcible sodomy in an assault that authorities said took place at the Chesterbrook Academy Preschool in early March.

On Wednesday, the family of a second 4-year-old girl contacted Leesburg Police to file a complaint, authorities said. After investigating that complaint, police said they obtained a warrant Friday charging Minor with aggravated sexual battery. Minor also faces an additional charge of indecent liberties with a child in connection to the first assault, authorities said.

Police said they received a complaint from the family of the first 4-year-old girl on March 7, after the child made comments to her parents.

Minor was a teacher and bus driver who supervised before- and after-school activities, Chesterbrook Academy spokeswoman Kathleen Shaffer said.

Chesterbrook Academy opened in 1999. About 100 students, ages 3 to 5, attend the private preschool on Cardinal Park Drive SE in Leesburg. Police said school officials are aware of both complaints and are cooperating with the investigation.

Shaffer said Minor was hired Oct. 29, 2009. He underwent a criminal background check as part of the hiring process and had no record of criminal activity or child abuse, Shaffer said.

“He’d never given us any indication to think he was dangerous,” Shaffer said.

The school learned in March about the allegations against Minor and placed him on leave, Shaffer said. The school later received a letter, dated April 27, from Loudoun County Child Protective Services stating that “the case was closed and the claim unfounded.” Minor was reinstated from leave May 3, Shaffer said.

Minor was arrested July 5 and fired from the school July 6, Shaffer said.

Jeff Dubé, spokesman for the Leesburg Police Department, declined to comment on when the second alleged assault occurred, or if it happened during the time Minor was reinstated.

Child Protective Services spokeswoman Heather Dziewalski said she would not comment on the case because of confidentiality laws.

Dubé said that he could not comment on any actions taken by Child Protective Services but that the case was never closed by police.

“Our charges were placed after the collection and examination of forensic evidence, which led to the arrest of Mr. Minor,” he said.

Minor remains held in the Loudoun County Adult Detention Center without bond pending an arraignment scheduled for Monday, according to authorities.

The investigation is ongoing, and Leesburg Police asked that anyone with information on these incidents contact Detective Shaw at (703) 771-4521. Callers wishing to remain anonymous can call the Leesburg Crime Line at (703) 443-TIPS.