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 A 21-year-old woman was arrested Tuesday for a human trafficking investigation that began last August in San Rafael, according to police.

San Rafael police responded to an advertisement on an internet escort website in August 2017 and agreed to meet with a woman in exchange for sex.

When the woman arrived, detectives learned that she was a victim of human trafficking.

According to detectives, the woman had been forced into prostitution by 21-year-old Andrea Lopez-Luna. Officials said Lopez-Luna controlled the woman by confiscating her money and identification information.

Lopez-Luna also allegedly threatened the woman to prevent her from reporting the illegal activity to police.

Police arrested Lopez-Luna's associate on Aug. 17. Diana Vasquez-Reyes was arrested on suspicion of aiding a prostitute and human trafficking.

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Lopez-Luna fled the area before detectives arrested her, and the Marin County District Attorney's Office issued a $100,000 warrant for her arrest.

On Tuesday, detectives located her at a house in San Carlos and took her into custody.

She was booked into Marin County Jail on suspicion of human trafficking, with bail set at $100,000.