(HOUSTON) -- An Amber Alert has been issued for a missing 2-year-old boy in Liberty County, Texas.
Devin Davis disappeared around 3:30 p.m. Tuesday afternoon while his mother and sibling were taking a nap in a home they moved into last week. When they woke up, Devin's mother found the front door open and Devin nowhere to be found.
Police did not know whether Devin simply wandered off or was abducted, according to ABC News affiliate KTRK in Houston.
A search party was concerned about thick underbrush nearby, as well as bodies of water containing alligators and difficult, muddy terrain.
"What we're worried about is the gators. There's gators everywhere, and they're crawling real bad," Deborah Scott, a neighbor, told KTRK. "We've got snakes out here too. I can't believe this baby's missing."
"We've had grown people missing in these woods," Scott added. "Man, it took four days to find them, and this is a 2-year-old."
More than 100 officials and volunteers were searching around the clock for Devin, according to KPRC in Houston. The searchers included the Houston Police dive team and Texas EquuSearch, according to KTRK.
Devin has red hair, is 30 inches tall and weighs 40 pounds. The last outfit he was seen wearing was a red-and-gray jersey T-shirt, jeans and Spiderman tennis shoes.
Physical evidence was found behind the house, but authorities were not immediately revealing what the evidence was.
Devin's parents were working with the FBI.
Several tips were called into the Liberty County Sheriff's Office, but none have resulted in any leads. Those with information are encouraged to call 936-336-4500.
Copyright 2012 ABC News Radio