An 18-year-old man believed to be a refugee from Africa is being held without bond on a sex trafficking charge after he was arrested for allegedly bringing two 15-year-old girls from Phoenix and then prostituting them on a classified website.

FBI assistant special agent Keith Byers says authorities arrested Edema Missiadan after police in Mesa, Arizona, relayed information that a girl possibly was being forced into prostitution in the El Paso area.

An undercover investigator responding to ads offering escort service on the notorious classified website Backpage.com set up a meeting at a Super 8 Motel in El Paso Wednesday evening, and Missiadan was arrested on one count of sex trafficking of children.

Trafficking suspect: Edema Missiadan, 18 (left and right) has been arrested on one count of sex trafficking of children for allegedly prostituting 15-year-old girls online

Classified: Missiadan allegedly had been using the site Backpage.com to offer escort services

The case against Missiadan involves two 15-year-old girls who were believed to have come to El Paso from Phoenix on Tuesday, said Agent Byers.

One of the alleged victims possibly was featured in at least 164 ads offering escort services outside El Paso, reported El Paso Times.

Missiadan made his initial court appearance on Thursday, telling a federal judge that he did not know why he was being charged, as he committed no crime, and said he is a US citizen.

According to officials, Missiadan is a refugee from Ghana and is believed to be a citizen of the West African nation of Togo.

Court records cited by the El Paso Times indicate that the 18-year-old's brother, 21-year-old Mawuli Missiadan, was arrested in June in Arizona on a slew of child prostitution and drug charges.

Claims of innocence: The teen, pictured on the right arm-wrestling over a pile of $100 bills, told a federal judge he did not know why he was being charged

Online presence: Missiadan's Facebook page is filled with selfies and images of him holding fans of $100 bills and flashing what appears to be gang signs

Edema addressed his brother’s arrest in a Facebook post in mid-June, calling for his release and claiming that he had been set up by a woman.

The younger brother's social media account is filled with selfies and images of Missiadan holding fans of $100 bills and flashing what appears to be gang signs.

Backpage,com is the second-largest online classified ad service in the United States after Craigslist.