Workers at the Detroit Water and Sewerage Department plant found the fetus Friday afternoon, The Detroit News reported. It appeared to be at 3- to 4-months gestation.

Second Deputy Chief James Tate said that there is no proof a crime has been committed. He suggested that the fetus is most likely the result of a miscarriage.

The sewage treatment plant, the largest in the country, handles waste water for Detroit and 76 other municipalities in Wayne County.