Four people have been arrested in San Antonio for the alleged human trafficking of a sixteen-year-old teenage girl. Three of them have been charged with sexual assaulting her.

The girl told authorities a couple sold her to another couple for $4,000 when she would not have sex with other people, according to the San Antonio Express-News.

The pair who allegedly “bought” the girl, reportedly gave her drugs and got her intoxicated. They allegedly had sex with her and forced her to have sex with others.

Rebecca Nicole Alvarez (22), Christopher Castoreno (34), Veronica Ann Diaz (26), and Adrian Colon (44) have been charged with trafficking.

Alvarez, Castoreno and Diaz have also been charged with sexual assault, and Colon has been charged with attempted sexual assault, according to the San Antonio publication.

San Antonio law enforcement officers responded to a call at a pawn shop where the 16-year-old victim told them that she was being followed by Alvarez and Castoreno. She told officers that she had been sexually assaulted and held against her will, said a SAPD spokesman to the local newspaper.

A mutual friend was reported to have introduced the young girl to Colon and Diaz who allegedly forced her to have sex with them. They asked the teenager to have sex with others but after she refused, they were said to have sold her to Alvarez and Castoreno for $4,000.

Alvarez and Castoreno then allegedly gave her drugs and got her intoxicated and then “forced her to have sex with other people at various locations around town,” the SAPD spokesman said.