not sure how it relates to ABD, but Thomas Cook abruptly ceased operations several days ago, when they were unable to find emergency financing to stay in business and were denied a bailout by the UK government. Unfortunately they didn't allow time to get their guests home if it did happen. the British government is arranging for all of their citizens to return to Britain. Don't know what the deal is if you're not a UK citizen.
There was one report of a hotel or resort owner in Tunisia (which I believe is a popular destination for British tourists) who was not allowing guests to leave unless they paid, because they feared Thomas Cook would not pay the bill.
The company has been around for many years, but they have been in financial trouble for some time, apparently they believe it is because people are now taking charge of booking their own holidays through the Internet and are not using package deals from travel agencies. at least that's what they think.