Egypt's tourism minister said on Thursday authorities would test food and hygiene at a hotel where a British couple stayed before dying last week, and that a forensic team would complete their postmortem in the coming days.
The couple, John and Susan Cooper, died within hours of each other in the Egyptian Red Sea resort of Hurghada on Aug. 21.
John Cooper, 69, died at the Steigenberger Aqua Magic Hotel and Susan Cooper, 63, died at a nearby hospital, prompting an evacuation of Thomas Cook customers.
No one was immediately available to comment from the hotel, which said last week there had not been a rise in cases of illness. Egypt's public prosecutor said on Saturday that engineers had checked the hotel's air conditioning system and found it to be sound.
Local officials initially said both had died from heart failure, but Egypt's public prosecutor said the cause of death was not immediately clear.