BASIN - Authorities say they're still looking for an Indiana teen who slipped into a high-flowing creek in northern Wyoming four days ago.

A Big Horn County sheriff's employee said Thursday that the search is ongoing for the 19-year-old, who went missing in the Dry Fork of Paint Rock Creek on Monday.

The sheriff's office issued a release Monday saying the young man was participating in a backcountry horse trip in a remote are of the Big Horn Mountains.

Sheriff Kenneth Blackburn has not released the name of the victim or any details of the search since Monday. Calls to Blackburn weren't returned.

A relative of other participants in the horseback trip told the Bedford Times-Mail in Indiana that searchers were using dogs, sonar equipment and cameras to locate the victim.