WASHINGTON — Police arrested a Montgomery County school’s janitor accused of sexually assaulting a 6-year-old student last month.

Ronald Greene, 54, was charged Tuesday with one count of second-degree sexual offense after police say he sexually assaulted a girl at Gaithersburg Elementary School.

The 6-year-old victim told detectives Greene sexually assaulted her while he was cleaning the girls’ bathroom on a school day in November, said Sgt. Rebecca Innocenti of the Montgomery County Police Department.

The victim told police Greene grabbed her from behind and placed his hand under her clothing, according to charging documents.

Police haven’t received any reports of additional victims, but ask anyone with information about the case or other possible victims to call police at 240-773-5400.

“It’s always possible there are additional victims, that’s why we urge anyone who believes maybe their child has been a victim to please come forward,” Innocenti said.

Greene has been on paid administrative leave since the investigation began in late November.

Gaithersburg Elementary School Principal Meredith McNerney reassured parents that the school is committed to the students’ well being.

“The charges represent a serious breach of trust, responsibility, integrity and the law. We expect and require our employees to be held to a high standard of character, and these allegations certainly violate that,” McNerney said in a letter to parents.

The school is providing counseling and support to students who need it.

WTOP’s Michelle Basch contributed to this report from Washington.