According to Capt. Mike Trice with the Hanover County Sheriff’s Office, the boy was walking along a trail with his father, his father’s girlfriend and his younger brother, who is also autistic.
The father, Robert Wood Sr, said the older boy ran off the trail into a wooded area after 2 p.m and although he tried to chase after him, he eventually lost sight of the youngster.
He added that his son does not speak.
Despite a huge search by law enforcement officials and at least 900 volunteers, nothing has been seen of Robbie in the 80 acre park, which is not fenced.
Hanover Sheriff Mike Trice was confident however that the boy will be found after blood hounds located his scent.
He told Fredericksburg.com: “My confidence is high that Robbie was in the park. The dogs have told us that Robert was there.
"We’re still looking. We’re doing tracks. We’re backtracking. We’re putting efforts back in where we were yesterday. By all indications, Robert was in that park and thats where he was last seen.”
Wood has blond hair and blue eyes. He was last seen wearing a red, long-sleeved T-shirt, blue athletic pants and blue shoes.