Crews searching Lake Michigan at Montrose Harbor amid reports of missing person

CHICAGO (WLS) -- A search is underway at Montrose Harbor on Chicago's North Side on Sunday night.

There are reports that a person is missing in Lake Michigan.

ABC7 Chicago is now streaming 24/7. Click here to watch

Video shows Chicago Fire Department personnel and other first responders on the scene around 10 p.m.

A helicopter is also being used to search the water.

What led up to the person's apparent disappearance was not immediately clear.

Authorities did not immediately provide further information.

This is a developing story. Check back with ABC7 for updates.