A witness notified police that they reportedly found a human head inside a box on a sidewalk on Chicago's West Side Thursday evening, Fox 32 Chicago first reported.

It happened just before 6 p.m. on Thursday when officers were dispatched to the 2600 block of West Taylor Street.

The witness told officers they were walking on the sidewalk when they discovered a box containing the victim's remains, Chicago Police told Fox 32. 

Police said it is unclear what led to the victim's death and that an investigation is ongoing. 

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Chicago police officers attend a graduation and promotion ceremony in the Grand Ballroom on Navy Pier on June 15, 2017 in Chicago, Illinois. Several civil rights organizations have filed a federal lawsuit against the city of Chicago seeking federal oversight of changes in the Chicago Police Department following repeated accusations of civil rights violations by officers in the department.  (Photo by Scott Olson/Getty Images)

No further details were immediately available.

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Chicago Police officers monitor the area outside of the Chicago Mercy Hospital where a gunman opened fire in Chicago on November 19, 2018.  (KAMIL KRZACZYNSKI/AFP via Getty Images)

The Cook County Medical Examiner's Office also confirmed it has been notified about the human remains, Fox 32 reported. 

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Police said  (iStock)

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Anyone with more information about this case is encouraged to contact CPD Area Four Detectives at 312-746-8251. 

Fox News Digital reached out to the Chicago Police Department for comment but did not immediately receive a response.