Clinton police evacuated some homes and detoured traffic Saturday after a suspicious package was reported on Main Avenue on the north side of the city. 

Clinton Police Cpl. Jon Melvin said at 2:35 p.m. a U.S. Postal employee reported a suspicious item lying next to the roadway on the north side of Main Avenue, which also is Iowa 136, near North 12th Street. 

Police and firefighters responded and determined that the based on the size and shape of the item, it resembled a possible improvised explosive device. 

Traffic was shut down on Main Avenue from 10th Street to Mill Creek Parkway. Also several residents in the immediate area were asked to evacuate their homes for safety, while outlying residents were asked to stay in their homes. 

The Iowa State Fire Marshal's Office inspected the item and determined it to be harmless and there was no danger to the public. 

The incident remains under investigation.