DETROIT -

Authorities in a small southern Michigan town have reached the one-year anniversary of the disappearance of three young brothers with some progress in the investigation but no sign of them.

Morenci Police Chief Larry Weeks said police would be conducting a road canvass early Friday morning. That's the same time one year ago they believe John Skelton drove his sons to northwestern Ohio and disposed of them.

Police believe Skelton left his home at 4:29 a.m. that morning with his sons and drove through Holiday City, Ohio, which is 17 miles away. Police said Skelton was back at the Morenci home by 7 a.m. However, the boys have not been seen since.

Skelton hasn't been charged with their murder but is serving time after being convicted of unlawful imprisonment charges. He says he gave the boys to an unidentified organization to protect them from their mother.

Weeks plans to speak Sunday at an event marking the anniversary of the disappearance of Andrew, Alexander and Tanner Skelton. He says police have received nearly 1,200 tips.