A man found a trash bag containing organs of an unknown animal while walking his dog Saturday on a trail near the 100 block of South Grove Street, an Ypsilanti police incident log said.

The Washtenaw County Medical Examiner's Office responded and determined the bag did not contain human remains, according to the log.

The man's dog initially led him to a bloody yellow shirt on the ground at about 3:52 p.m. The 45-year-old man looked around and found a black trash bag with "organs partially hanging out," the log said.

Officers found a large butcher knife next to the bag.

Officials at the Medical Examiner's Office didn't identify the type of animal, but said it could be a sheep or deer.

Police do not know how the bag ended up on the trail. No further information was available this morning.