CREEK COUNTY, Oklahoma - The body of a man missing since Sunday was discovered after a four-day search.

Crews were back out in the Creek County town of Silver City Wednesday, searching for 19-year-old David Lane Howard. They say Howard went swimming and hiking with friends at Buckeye Creek Sunday and disappeared. The friends told investigators they became separated sometime between 10:30 a.m. and noon.

The Oklahoma State Bureau of Investigation said the body was found by a power easement near 61st Street and 481st, east of Oilton.

Heat and thick brush in the area caused challenges for searchers, and multiple agencies joined in to look for the man.

"We've got the trained trackers in the field; they're having a hard go of it because of the terrain," said Creek County Sergeant Les Vaughan.

Creek County and Tulsa County deputies, Jenks police officers, the Corps of Engineers, county road crew department and state investigators all took part in the search. The Tulsa County Sheriff's Office tracking team located the body.

Investigators said there have been conflicting stories about what happened Sunday but said there is just too much they don't know to suspect any kind of foul play at this time.

OSBI said special agents are investigating the nature of the death.