Volunteers from a group called Texas EquuSearch set out on foot and by ATV in a field in northeast Houston, where Vence told police he was assaulted by Maleah's kidnappers after he noticed something wrong with the Bowens' silver 2011 Nissan Altima that he was driving and pulled over.
According to police, Maleah's stepfather told authorities that he, Maleah and Maleah's 2-year-old brother were "abducted by 3 males sometime Friday night" in North Houston.
Police later issued a photograph of Vence showing a mark on his forehead, hoping that people may recognize him since he can not recollect nearly 24 hours.
He said he was in and out of consciousness until about 6 p.m. Saturday, when he woke up on Highway 6 with the 2-year-old boy. His daughter was gone.
Houston police issued an Amber missing person's alert on May 5, after her father Darion Vence told them he and his two children had been abducted on May 3.
The search for Maleah Davis continues following an Amber Alert Sunday.
"I'm terrified for Maleah", Bowens said of her daughter, in an interview with ABC station KTRK-TV in Houston. They are especially concerned because the 5-year-old has had multiple brain surgeries, most recently in early April.
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Maleah's stepfather, Darion Vence, reported her missing Saturday.
According to police, the alleged abductors kept Maleah, and their whereabouts are unknown. "I realize there are a lot of blanks in that story, but we're hoping the public can fill in the blanks", Holbrook said during a news conference Sunday afternoon.
One purportedly made a comment that "Maleah looks very nice, looks very sweet", Holbrook said, quoting Vence's statement to officers.
Meanwhile Vence's own vehicle, a silver 2011 Nissan Altima which he says was left on the highway, has been reported as stolen. She was last seen wearing a light blue Under Armour jacket, blue jeans, and gray Under Armour tennis shoes with pink and white details.
The stepfather claimed to have been driving his kids in their mother's vehicle to pick her up from the George Bush Intercontinental Airport, Holbrook said.
Maleah is described as an African-American female with black hair and brown eyes.
Police encourage anyone with information to contact Houston Police Department Homicide at 713-308-3600 or Houston Crime Stoppers at 713-222-TIPS.