Celebrity chef Jamie Oliver has said he is "devastated" that his restaurant group has gone into administration.
The group, which includes the Jamie's Italian chain, steak house Barbecoa and Fifteen, has appointed KPMG administrators.
The move could put more than 1,000 jobs at risk, with an estimated 1,300 people working for the UK business.
The international branch of Jamie's Italian is unaffected, along with Oliver's other companies, which handle his media and licensing deals.
A more detailed announcement on the situation is expected later today.
Writing on Twitter, Oliver said he was "deepy saddened" by the events.
"I’m devastated that our much-loved UK restaurants have gone into administration," he wrote.
"I am deeply saddened by this outcome and would like to thank all of the people who have put their hearts and souls into this business over the years. Jamie Oliver."
In an official statement, the chef added: "We launched Jamie's Italian in 2008 with the intention of positively disrupting mid-market dining in the UK high street, with great value and much higher quality ingredients, best-in-class animal welfare standards and an amazing team who shared my passion for great food and service. And we did exactly that."
The move does not come completely out of the blue, with Oliver's restaurant empire taking a few knocks over the past two years.
In 2018, Jamie's Italian closed 12 of its 37 sites, and Barbecoa went into a pre-pack administration, leading to the closure of its Piccadilly branch.