Houston ? The bodies of five people, including three young children, were found Saturday afternoon on a sprawling property with several structures in northeast Houston, police said.

A neighbor made the grisly discovery after seeing a man’s body on the porch next to a .22-caliber rifle, said police Lt. Dan Harris.

The bodies of a woman and a boy were found in a shack on the property, Harris said. The bodies of a boy and girl were found in another shack. The children were believed to be between ages 4 and 9.

Investigators declined to speculate on the causes of death, although they said there were no obvious signs of a struggle. They also declined to release identities of the victims or say whether they were related.

The man was last seen alive as recently as Friday afternoon, witnesses told police. Next-door neighbor Sally Potts said the man and the girl walked one of the family’s four dogs on Thursday.