Officers were called the assembly plant on Friday at about 8:30 p.m. for a report of harassment.
Police were met by the complainant who works for a construction company helping retool the plant. Union leaders and representatives from Fiat Chrysler Automobiles (FCA) were also there.
Police said after officials began an internal investigation into the incident, another employee located a second noose Friday.
Windsor police are working with FCA and union leaders to determine who is responsible for leaving the rope.
Local electricians union calls incident 'unacceptable'
Karl Lovett, business manager of the International Brotherhood of Electrical Workers Local 773 in Windsor, said he has received many calls from his members in the last week.
"Everybody on the job was furious," said Lovett. "They're really outraged and enraged."
Lovett said his members are among the thousands of contractors currently working on retooling the Windsor Assembly Plant.
Lovett said he is urging the person or persons responsible for the alleged incidents to come forward.
"There are thousands of people in there right now. Somebody had to have seen something," he said, citing that if the person(s) responsible was a member of his union, he would not hesitate to fire them.
"I would make sure it would come down on them because it's completely unacceptable ... the person would definitely be facing expulsion from the union," he said. "We don't know who did it or what trade did it but somebody did it and they should definitely pay the piper."
FCA Canada issued a statement which read in part: "FCA Canada has a zero-tolerance policy regarding harassment or discrimination of any kind. This policy applies not only to our own employees, but also to vendors or contractors working at our facilities. We are currently working in cooperation with local authorities to investigate a recent allegation of workplace harassment made at our plant."Suggest a correction