The Steigenberger is a luxury German hotel group with a deadly image at this time. The air conditioning system at the Steigenberger Aqua Magic Hotel in Hurghada., a popular diving and beach resort in Egypt was working fine. Rumors a British couple died in unknown circumstances while on holiday in Egypt because of the A/C is sound, the public prosecutor said on Saturday, citing a report by engineering experts.

The prosecutor’s office said it was still waiting for a medical report to determine what caused the death of John and Susan Cooper who passed away hours apart on Tuesday while staying at the resort.

Thomas Cook, which organized the package travel arrangement said on Friday it had received further reports of illness among guests at the hotel, without elaborating.

The German hotel said on Friday that there had not been a rise in cases of illness.

In a statement, the Egyptian public prosecutor said that engineers assigned to check the room where the deceased couple had been staying concluded that “all equipment was sound and that there was no leakage or emission of any poisonous or harmful gases.”

“All equipment was working properly and had no faults,” it added.

Egyptian officials said on Friday that both deaths were from heart failure, but the public prosecutor said the cause was still not yet clear.

Tourism is important for the Egyptian Economy and the industry had suffered greatly for years due to security issues.