CEDAR RAPIDS, Iowa – A former youth basketball coach from Iowa who pleaded guilty in June to sexually exploiting minors and possession of child pornography had 400 explicit photos of underage boys. This is more than previously thought, The Des Moines Register reported, citing court records.

Monticello resident Greg Stephen possessed nude images or videos of approximately 400 boys, according to his plea agreement the news agency reported. His victims included former players, their friends, and other young athletes.

Stephen, 42, pleaded guilty in June to having photographed or recorded five minors masturbating between 2010 and 2013, and having sexually explicit pictures of another minor. He admitted to transporting those images across state lines, The Des Moines Register reported in June.

But according to the 19-page plea agreement, which was filed in the online federal court system Thursday afternoon, Stephen’s offenses exceeded his June court testimony. The document said investigators obtained a USB device from Stephen that reportedly contained 400 images or videos of “nude boys displaying their genitals” or “masturbating.”

youth basketball coach

Former Iowa basketball coach Greg Stephen pleaded guilty to sexually exploiting minors and possessing and transporting child pornography (Booking photo)

The document said Stephen used the identities of teenage girls to send nude photos and videos over Facebook and Snapchat to boys who in turn sent explicit images of themselves.

The parent of one of Stephen’s former players told the Register in June that investigators found “over a hundred” folders with photos or videos of naked boys on Stephen’s hard drive, labeled with their names, but the exact number of his victims has remained unclear.

Moreover, the coach secretly recorded boys during trips to basketball tournaments. Furthermore, there were more crimes when he recorded himself fondling nude players as they slept.

Authorities began investigating Stephen in February after his former brother-in-law reportedly found a USB device in Stephen’s bathroom and gave it to police. As a result of the investigation, Stephen was arrested in March.

Stephen will be sentenced at a later date, but he faces a minimum of 15 years in federal prison and a maximum of 180 years in prison if Judge C.J. Williams chooses to run the sentences for each crime consecutively.

He did not describe his crimes in court Thursday and spoke only to answer questions from the judge. “Yes” and “yes, sir” were his most common answers.

Each of Stephen’s crimes carry a fine of up to $250,000 as well as a $100 assessment per count and a $5,000 special assessment due to the nature of the crimes.

He has been in custody since his arrest and will remain jailed pending sentencing.