A 22-year-old taekwondo instructor from Florida was arrested Tuesday after a 13-year-old girl told authorities he forced her to perform a sex act on him when she was 10 years old, The Miami Herald reported.

Sebastian Choi was the girl’s instructor at “Team Taekwondo” in 2015 when the alleged sexual abuse occurred, the report said. The martial arts school is located in Doral, Fla., which is about 20 miles northwest of Miami. Police were alerted after the alleged victim told her mother.

Choi appeared in bond court Wednesday where he faced two counts of sexual battery on a minor by an adult and two counts of lewd and lascivious molestation of a child by an adult.

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Miami-Dade Police Detective Angel Rodriguez called the charges “concerning” because Choi “was the victim’s taekwondo and P.E. instructor with access to many children.”

A spokesman for the martial arts school said Choi was suspended after the allegations were reported and “is now ineligible for any USA Taekwondo-related activity until such time as he is cleared of any and all allegations,” WPLG reported.

Choi is being held without bail.