BASTROP, Texas -

Texas authorities have charged a Bastrop youth minister who they say had sex with a 16-year-old girl.

The Bastrop County Sheriff's Office says 25-year-old Isahiah Arellano was arrested and charged with three counts of sexual assault this week. Authorities say Arellano was a youth minister with the Faith Impact Fellowship in Bastrop County. They say a family member caught him having sex with the teen at a friend's house in April.

Arellano tells authorities he only had sex with the teen once. She tells them it happened three times.

Authorities are working with the church pastor. No other cases have been reported.

The teen's relatives tell KXAN-TV that they stopped attending the church. The pastor says Arellano was fired.

It wasn't immediately clear if he has an attorney.