The family of a married couple who went on vacation in Egypt will not find out how they died for at least ten days, Thomas Cook admitted.
Food, water and air conditioning systems are being investigated as the authorities try to pinpoint the cause of the mysterious sudden death of John and Susan Cooper within four hours.
The company's CEO, Peter Fankhauser, said the couple's family would "hopefully" find out the cause in 10 days. Tests have been completed.
The couple from Burnley, Lancashire, died during his stay at the Steigenberger Aqua Magic Resort Hurghada on the Red Sea.
Her daughter Kelly Ormerod, 40, said there was something "suspicious" about her sudden death.
Mr. Fankhauser told Sky News, "We have no real evidence of what caused death, but what I can promise. At Thomas Cook, we do everything we can to support the family and support the Egyptian authorities to get to the root of the problem.
"There is no evidence that it is carbon monoxide poisoning. We have no evidence, but I do not want to rule anything out before I really know the cause.
He said, "Twenty-four hours after the death of the couple, we had our specialists at the hotel. They took probes for the food, for the hygienic systems, for water and for the air conditioners, and all these probes are now in Egypt.
"They are now examining and testing the probes and we are supporting them, but it will take about 10 days."
Guards were dispatched to ensure 24-hour surveillance of the room in the five-star Hotel occupies.
Traveling expert Nick Harris doubted the speed with which the authorities decided that the Coopers would die just hours away from each other for natural reasons.
He said, "It sounds like a cover-up, I think it could be carbon monoxide poisoning, food poisoning or water poisoning
" It has even been suggested that the woman died of a broken heart. "
" I speculate, but it seems that the officials are doing everything they can to blame elsewhere.
Kelly, returning from the resort with her three children today, is waiting for the results of an independent second autopsy. She insisted that her parents were both "fit and healthy" and had been in "perfect health" just hours before her illness.
She said, "I think something suspicious happened, something happened in this room."