A man arrested this week at Washington Dulles International Airport for sexually assaulting and assaulting children worked as a safety assistant and track coach at Northwood High School in Montgomery County, Md., The school district confirmed to NBC Washington.

Giovanni Di Angelo Reumante, 31, of Takoma Park, was arrested Tuesday by U.S. customs and border protection officials after arriving on a flight from Punta Cana, Dominican Republic, authorities said.

Montgomery County Police obtained an arrest warrant for him on December 23 and filed a nationwide extradition warrant in his case.

Reumante faces two charges for allegedly having sex with an underage student who has since graduated from Northwood High School, school principal Jonathan Garrick said in a letter to the community.

The alleged incidents occurred during and after school hours, police said in a statement on Thursday. Reumante had worked as a track coach at Northwood High School since 2013.

It was not immediately clear whether Reumante had a lawyer.

Reumante has been put on administrative leave and is not allowed to enter the school or school grounds, Garrick said.

“The allegations against Mr. Reumante are disturbing, reprehensible and contrary to the values ​​of MCPS and our community,” the director said in the post. “The safety and security of our students is our top priority and we continue to work with our partners every day from the Montgomery County Police Department, State Attorney’s Office and Child Protective Services to guarantee a safe environment for our students. and the staff. “

The police fear that there are no more victims. School authorities encouraged anyone with information about this case or other potential victims to contact the authorities.

On Christmas Eve, CBP officers in Dulles also arrested Sir Chuku Maurice Ngare, 44, of Marietta, Georgia, at the boarding gate of a flight to Germany on charges of sexual assault and assault. on children.

The two suspects were turned over to the Metropolitan Washington Airport Authority to begin extradition proceedings, CBP said.

As of Thursday morning, it was not clear whether Reumante had been extradited to Montgomery County.

Stay with NBCWashington.com on this developing story.