CHICAGO (AP) 鈥 An overnight fire caused extensive damage to an iconic Chicago restaurant that's known for its breakfasts and is filled with decades of memorabilia, authorities said.

Firefighters were called to the Palace Grill around 10 p.m. Thursday, Chicago Fire Department spokesperson Larry Langford on X, formerly known as Twitter, in a post with photos of the fire damage.

He said the fire caused no injuries but there was extensive damage to the interior of the restaurant, which opened in 1938 on Chicago鈥檚 Near West Side and has long been a popular spot for hockey players, police officers and firefighters.

The fire's cause was under investigation, but Langford told the Chicago Sun-Times a preliminary investigation indicates a grease fire started in the kitchen near a grill. He said it was put out 鈥渞elatively quickly" after firefighters cut a hole in the roof and poured a 鈥渃onsiderable amount鈥 of water on the flames.

Owner George Lemperis said his restaurant, located blocks from Chicago鈥檚 United Center, was closed at the time and his employees had left about 3 p.m. nearly seven hours before the fire began.

鈥淭here is a lot of damage,鈥 Lemperis told WLS-TV. 鈥淲hen I first got the call, I just assumed it鈥檚 going to be something small and my phone just kept blowing up and blowing up and I immediately got in the car and drove here. When I got here, I saw the damage and I was stunned.鈥

Early Friday, crews were seen boarding up the restaurant's windows and doors.

Michael Rosenbaum said he has been coming to the Palace Grill with his family for a dozen years. He stood outside the fire-damaged restaurant Friday and called it an 鈥淎merican institution" that "has meaning beyond getting bacon and eggs.鈥

鈥淚t鈥檚 a little bit like somebody died. You can never replace this," said Rosenbaum, 70, a business consultant who lives in Chicago. "This is one of those things that is there and it鈥檚 special. And when it鈥檚 gone, what can you do?鈥

The Palace Grill is famous for its breakfast and then-Vice President Al Gore once treated Russian Prime Minister Viktor Chernomyrdin to a visit to the eatery, the Sun-Times reported. The restaurant was also featured on 鈥淭he Oprah Winfrey Show.鈥

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