Britain's Financial Reporting Council said today it was considering investigating the collapse of travel company Thomas Cook.
"In light of recent developments at Thomas Cook, we are considering whether there is any case for investigation and enforcement action as a matter of urgency and in co-operation with the Insolvency Service," an FRC spokesman said.
Meanwhile, as the collapse of Thomas Cook left hundreds of thousands of passengers reliant on the British state to repatriate them, Prime Minister Boris Johnson has questioned whether bosses should have paid themselves so much ahead of its demise.
Running hotels, resorts and airlines for 19 million people a year, Thomas Cook currently has around 600,000 people abroad.
It will need the help of governments and insurance firms to bring them home from places as far afield as Cancun, Cuba and Cyprus.
Speaking in New York, Boris Johnson questioned why the state should be left responsible for the actions of handsomely paid directors and said tour operators should have some sort of insurance against such debacles.
"I have questions for one about whether it's right that the directors, or whoever, the board, should pay themselves large sums when businesses can go down the tubes like that," Johnson said.
"You need to have some system by which tour operators properly insure themselves against this kind of eventuality," he said.
Thomas Cook was brought down by a $2.1 billion debt pile, built up by a series of ill-fated deals, that hobbled its response to nimble online rivals.
It had to sell three million holidays a year just to cover interest payments.
With the business draining cash, chief executive Peter Fankhauser found its lenders were no longer willing to step in.
Fankhauser has earned £8.3m, including £4.3m in 2015.
The UK government decided Thomas Cook was a bet it did not want to take.
Thomas Cook's demise, announced early yesterday morning after failing to secure a deal with creditors or a government bailout, sparked alarm at hotels where some customers have been asked to pay their bills again by out-of-pocket resort owners.
"I think the questions we've got to ask ourselves now: how can this thing be stopped from happening in the future?" Johnson said.
"How can we make sure that tour operators take proper precautions with their business models where you don't end up with a situation where the taxpayer, the state, is having to step in and bring people home?" he asked.
Emergency flights brought 14,700 people back to the UK on 64 flights yesterday, and around 135,300 more are expected to be returned over the next 13 days, Britain's aviation regulator said.
74 flights were scheduled for today to bring back 16,500 people. More than 1,000 flights are planned over the next couple of weeks.
"A repatriation of this scale and nature is unprecedented and unfortunately there will be some inconvenience and disruption for customers.
"We will do everything we can to minimise this as the operation continues," Richard Moriarty, Chief Executive at the Civil Aviation Authority, said.
"We want people to continue to enjoy their holiday, so we will bring them back to the UK on their original departure day, or very soon thereafter," he added.