KALAMAZOO, Mich. — FBI Detroit asked for help from the public Monday in providing information related to an ongoing child pornography case.

David Yellen, a well-known gymnastics photographer and videographer, was arrested June 1 on two charges of possession and distribution of child pornography, according to FBI Detroit.

The charges stem from a complaint that alleged Yellen traded sexually explicit photos of minors online, investigators said.

Yellen had been contracted by multiple gymnastics academies in Michigan, and was contracted by the United States Women’s Gymnastics Judges Association to create training materials and films for new judges, according to FBI Detroit.

As of Monday, Yellen lives in Michigan, but has traveled nationally as a gymnastics photographer and videographer, investigators said.

Anyone with relevant information related to this investigation is asked to fill out a FBI Detroit questionnaire online or contact FBI Detroit through email.

In addition, if you or a loved one are feeling distressed, you’re encouraged to call the 24/7 National Suicide Prevention Lifeline by calling or texting 988, or by going online.