FARGO, N.D. — A man who was a federal fugitive for more than four years before he was arrested with help from a smartphone app has pleaded guilty to two counts of child pornography.

Adney Allen is charged in North Dakota with possession and distribution of materials involving the sexual exploitation of minors. The 51-year-old Allen was indicated in July of 2009. He was arrested in November of 2014 on the Red Lake Indian Reservation in Minnesota.

Authorities said the tipster who notified police about Allen learned of the suspect’s fugitive status after the agency launched its Operation Predator app. Allen was among the app’s featured fugitives.

Allen faces 30 years in prison. Sentencing is set for Sept. 14.

A federal public defender was not immediately available for comment.