MOUNTAIN VIEW – A months-long child pornography investigation culminated Wednesday in the arrest of a Church of Jesus Christ of Latter-day Saints missionary in Fremont, authorities said.

Detectives opened the probe in September after receiving a tip that someone in a private Facebook Messenger group chat was linked to more than 20 cyber tips about suspected child pornography, Mountain View police spokeswoman Katie Nelson said in a news release.

Nelson said the group chat included members possibly as young as 13 years old.

Detectives spent months poring over and ultimately identifying numerous videos and images of child pornography, Nelson said.

“These investigations take time, particularly due to the graphic nature of the imagery our teams are exposed to, along with the amount of requests that we send out to ensure we are getting as much information as possible,” Nelson said in the news release.

Around 8 a.m. Wednesday, authorities arrested Hayden Hunter, 19, of Pleasant Grove, Utah, on suspicion of child pornography and distribution of child pornography, Nelson said.

Nelson said detectives are concerned there may be additional victims. Anyone who interacted with katieteal15@gmail.com — a username and alias Hunter allegedly used — or with Hunter during his time in the Bay Area as a missionary can email Sgt. Tim Dahl at timothy.dahl@mountainview,gov.