Search teams intensified efforts Saturday to find renowned long-distance runner Micah True, who mysteriously vanished four days ago after heading out for a run in New Mexico's rugged Gila National Forest.
The 60-year-old True, whose long-distance running prowess is detailed in the book "Born to Run, left for a routine run Tuesday from a lodge. A search began the next day.
Though daytime temperatures in southwest New Mexico have been mild, temperatures have dipped into the mid-20s on recent nights. True was last seen wearing only shorts and a T-shirt and carrying a water bottle.
Fourteen search teams that were scouring the area Friday were supplemented with additional volunteer teams from across the state Saturday morning, state police spokesman Lt. Robert McDonald said. Teams were on horseback, using dogs and a helicopter and search plane were being used.
Still, as the days pass, the chances of a successful rescue diminish.
"We're going to do everything possible to cover as much ground as possible, but it's already been four days," McDonald said. "By no means are we going to give up, but time is of the essence as always in a search and rescue effort."
True, who lives in Boulder, Colo., is the race director of The Copper Canyon Ultra Marathon, a 50-plus mile extreme race that took place in Urique, Mexico on March 4. He has been featured in the magazines "Running Times" and "Outside," according to the Silver City Daily Press, and was the central character -- known as "Caballo Blanco" -- in Christopher McDougall's nonfiction best-seller "Born to Run."
He was staying at The Wilderness Lodge and Hot Springs near the Gila Cliff Dwellings in southwestern New Mexico.