UK Prime Minister Boris Johnson refused to bail out the collapsed travel firm Thomas Cook.

The company had asked the UK government for £150 million, or about $186 million, which the prime minister refused over what he said was the "moral hazard" doing so would cause for other firms at risk of collapse.

The company warned earlier this year that Brexit had reduced demand among UK vacationers.

The UK government has committed to repatriating an estimated 150,000 UK tourists at a cost of about £100 million.

Stranded passengers can find more information at the UK Civil Aviation Authority's website, or its 24-hour hotline: 0300 303 2800 from the UK and Ireland and +44 1753 330 330 from overseas.

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Hundreds of thousands of tourists have been left stranded after UK Prime Minister Boris Johnson refused to grant the collapsed travel firm Thomas Cook a bailout of £150 million, or about $186 million.

Talks between the United Kingdom government and the 178-year-old company broke down Sunday, putting 22,000 jobs at risk and triggering the biggest UK peacetime repatriation effort in modern history.

Roughly 600,000 customers of the firm, including 150,000 Brits, have been affected by the collapse.

The company had warned earlier this year that Brexit was causing consumers to put off their holiday plans.

Read more: Roughly 600,000 travelers are stranded around the world after British travel provider Thomas Cook declares bankruptcy

Johnson said on Monday that all UK customers would be brought back, with total costs to British taxpayers expected to total about £100 million.

Asked about the crisis, however, the UK prime minister insisted it would have been wrong to bail out the company.

"It is perfectly true that a request was made to the government for a subvention of about £150 m​illion," Johnson told reporters during a flight to the UN General Assembly in New York.

"Clearly, that is a lot of taxpayers' money and sets up, as people will appreciate, a moral hazard in the case of future such commercial difficulties that companies face."

He said executives at the company must be held responsible for the firm's collapse.

"One is driven to reflect on whether the directors of these companies are properly incentivized to sort such matters out," he said.

The opposition Labour Party said the prime minister should have intervened to prevent the firm's collapse.

"To just stand to one side, I just don't think that's wise government," Labour's shadow chancellor, John McDonnell, told the BBC, adding that he believed that government had an "ideological bias" against any form of state intervention.