A bomb and arson squad responded and found the package to contain two bricks, and was determined to be harmless. It was left near the Cloud Gate sculpture -- better known as "The Bean."
"There was a suspicious package that was found, it was covered in duct tape and had wires sticking out of it," said Mitchell Crooker, Chicago Fire Department.
"They had us evacuate the restaurants and move everybody out," said Bernie Laskowski, Park Grill.
Police say the package may have been part of a role-playing game between park visitors. They have three suspects in custody.