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WHEATON, Md. (WUSA9) -- A teacher accused of sexually assaulting a 15-year-oldboy with autism has fled the country, according to Montgomery County Police.

Police say on November 11 they started investigating allegations that 25-year-oldYee Tak Sharon Kui of Rockville, who taught at Frost School in Wheaton, assaulted the boy. According to police: "The Frost School is a private special education school which serves children and adolescents with emotional and behavioral disabilities, autism spectrum disorders and related special needs."

Minister Ronald Harding bravely stepped to the microphone with his wife to describe his son's reaction. They were driving past the Frost School in Rockville, where he was a student ofKuion their way to report his alleged abuse at her hands to child protective services.

"He began literally ripping pieces of the door panel off the inside of our car. It's challenging for him because with autism, he does not display his emotions. But he feels them deeper than most of us."

They had struggled for years to find the right school for the autistic by high functioning 15-year-old. But police now believe that while his parents were at church,Kuisent salacious text messages and then twice came to their home and had sex with the child.

"The audacity of what happened in our home while we were at church."

"This was a particularly disturbing case. Our victim is a child, and a child of special needs. He should have been nurtured and protected by his teacher," officials said.

Someone in Kui'sRockville apartment declined to talk to WUSA9, but police say Hong Kong is exactly where the alleged abuser is now. Early in the morning after they searched her home and obtained an arrest warrant, she took a flight from New York to China.

"I think the Chinese government will have sufficient investigative leads to try and locate her. I don't think it's a matter of if, it's a matter of when," Police said.

The Frost School says as soon as it found out about the text messages between Kui, a manager called her in, suspended, and then terminated her. It was that meeting that alerted her she was in deep trouble. And sent her fleeing to China before police had a chance to sweep her up.

Kui is accused of going twiceto the boy's home while his parents were out of the house and then engaging himin illegal sexual contact, say police. She facestwo counts of Third Degree Sex Offense, Sex Abuse of a Minor, and Sexual Solicitation of a Minor.

Police sayan investigation conducted with the United States Department of Homeland Security revealedKui fled to Hong Kong to avoid prosecution.

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