Authorities say the body of a 5-year-old Virginia boy who had been missing since Sunday has been found in a septic tank near his home.

Pulaski County Sheriff Jim Davis announced the discovery Thursday during a brief news conference.

Noah Thomas was last seen by his mother on Sunday morning at the family's home in Dublin. Several hundred law enforcement officers and volunteers had been searching for him since then.

Police had received more than 100 tips from around the country.

Davis said earlier Thursday that the tips included sightings of boys and reports of suspicious vehicles in the child's neighborhood.

Davis stressed after Noah's discovery that no one is in custody and that an investigation is continuing. He said the boy's family is cooperating with investigators.