Someone smashed a glass door at Lou Mitchell’s on West Jackson Boulevard early Sunday morning, Chicago police said.The incident occurred at 4:31 a.m., and no injuries were reported, police said. Nothing was taken from inside. Lou Mitchell’s opened for business Sunday morning, and the broken window was boarded up. No arrests have been made.Bob Chiarito/For the Sun-Times According to a staff member at the 101-year-old Chicago eatery, someone threw a rock through the glass door. The staff member said they don’t know if the incident was captured on surveillance video, but the restaurant opened Sunday as the staff waited for the debris to be removed and the window boarded up. Related Palace Grill owner vows fire won’t be final chapter for historic West Side eatery that’s fed Blackhawks, big shots and beat cops Vandals break windows with Palestinian flags at Nabala Cafe for second time in two months At 100, Lou Mitchell’s diner remains an iconic slice of Americana The owners of Lou Mitchell’s didn’t immediately respond to a request for comment.No one is in custody.Contributing: Sophie Sherry