London:British travel giant Thomas Cook has collapsed after last-minute negotiations aimed at saving the 178-year-old holiday firm failed, the media reported on Monday.
The UK Civil Aviation Authority (CAA) said the tour operator has "ceased trading with immediate effect", media reported.
The CAA said in a statement on Sunday night: "All Thomas Cook bookings, including flights and holidays, have now been cancelled."
"We know that a company with such long-standing history ceasing trading will be very distressing for its customers and employees and our thoughts are with everyone affected by this news."
One of the world's best known holiday brands, the business was founded in 1841 in Leicestershire by cabinet-maker Thomas Cook.
Peter Fankhauser, Thomas Cook's Chief Executive said on Sunday night that the firm's collapse was a "matter of profound regret".
Commenting as the company entered compulsory liquidation, Fankhauser also apologised to the firm's "millions of customers, and thousands of employees".
The tour operator's failure puts 22,000 jobs at risk worldwide, including 9,000 in the UK.