Streets were blocked off and a heavy police presence could be seen in Chicago's Gold Coast neighborhood early Friday morning.

A number of police vehicles and ambulances were seen near Dearborn and Division Streets.

Shell casings were seen on the ground but police have not yet said what happened.

Witnesses reported hearing gunshots in the area.

"I've heard gunshots before but this was a lot louder," Colin Schwartz said.

Dearborn Street at West Division Street was shut down due to the ongoing police investigation.

Chicago police did not immediately respond to NBC Chicago's request for comment.

Check back for more on this developing story.

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