Authorities say 33-year-old Thomas Hinrichs met the young girl, said to be 16 years old, on social media.
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The alleged incident happened earlier this year, police said, and according to court papers, it occurred in a motel room in Centereach approximately nine miles from the suspect's home.
He was arrested Thursday afternoon at his home in Sound Beach and charged with third-degree rape and third-degree criminal sex act.
Hinrichs said nothing in court and was ordered held on $50,000 bail.
On his Facebook page, Hinrichs claims to be a member of the Rocky Point Volunteer Fire Department and a five year employee of the Long Island Rail Road, where he has worked as an usher.
A spokesman confirmed to Eyewitness News that that Hinrichs has been suspended without pay.
Police are now trying to determine if there may be more victims out there.
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Detectives are asking anyone with additional information to call the Sixth Squad at (631) 854-8652 or call Crime Stoppers at 1-800-220-TIPS.
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