SUNOL — Detectives were searching for clues Monday in the death of a man found dead near railroad tracks Sunday in Niles Canyon that authorities are classifying as a homicide.

The Alameda County Sheriff’s Office, which is leading the investigation, did not reveal how the man died, and they were still working Monday to determine his identity, agency spokesman Sgt. J.D. Nelson said. Two hikers in Niles Canyon came upon his body and contacted authorities around 2:45 p.m. Sunday, Nelson said.

The hikers found the man near the tracks adjacent to Highway 84 (Niles Canyon Road); they were near the highway’s mile marker 14, a mile east of Palomares Road, Nelson said. The man is estimated to have been in his 20s.

“We don’t have any vehicles in the area, no anything,” Nelson said. “We don’t know how the man got there. We’re looking for any information we can find.”

Authorities encouraged anyone who may know anything to contact their anonymous tip line at 510-667-3622.