The deaths of a British couple who were staying at a hotel in Egypt’s Red Sea resort of Hurghada were caused by E coli bacteria, according to test results released by Egypt’s chief prosecutor on Wednesday.

John Cooper, 69, had acute intestinal dysentery caused by E coli, and 63-year-old Susan Cooper had haemolytic uremic syndrome (HUS), probably because of E coli, said the Egyptian general prosecutor Nabil Sadek.

He said the couple’s bodies showed “no criminal violence”; other tests on air and water at the hotel found nothing unusual. Thomas Cook evacuated 300 guests from the hotel as a precaution.

Their daughter, Kelly Ormerod, who was with them the night before they died, has said they used perfume to mask a strange odour in the room.

The forensic report denied there had been any leakage of harmful gases into the room. However, it detailed how the “unknown smell” noticed by Ormerod was “due to a leak of insecticide used in the next room”.

The report added that the insecticide, lambda-cyhalothrin, a chemical commonly used to control pests in home gardening or in agriculture to prevent insects eating crops, was safe to use, and denied that it had anything to do with the deaths.

The report added that the postmortems showed John Cooper died from a cardiac arrest after blockages to an estimated 80% of the veins in his heart. He also tested positive for the E coli bacteria, which caused the vomiting and diarrhoea he experienced shortly before his death. The report adds that he had consumed alcohol and hash, a kind of marijuana. There is no indication in the report that either contributed to his death.

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Susan Cooper is detailed in the report as suffering from Hemolytic uremic syndrome, a condition that affects blood vessels and blood, and often occurs after people are infected with E coli. The report mentions that it was suggested that she contracted E coli “as she was staying with her husband and had eaten the same food”.

The report also states that at 11.30am on the day they died, the Coopers’ daughter called doctors in the hotel to examine her parents. John Cooper was experiencing diarrhoea and vomiting and the “doctors gave him medicine they thought was appropriate, this being Ringer’s solution (rehydration salts) and a dexamethasone injection, a corticosteroid”. His condition worsened and he died in his room.

Ormerod said she had “no faith” in the Egyptian authorities’ claims, saying she wanted more transparency and would wait for the results of tests done by the UK Home Office before coming to any conclusions about how her parents died.

“Thomas Cook put a report out that there were high levels of E coli at the hotel. Whether the Egyptians have honed in on that, I have no idea.”

She expressed doubt that anyone could die so shortly after exposure to the bacteria, accusing the Egyptian authorities of seeking a quick answer in order to protect the nation’s tourism industry.

“I don’t know what tests they have done. The report I have seen, from the media, not sent to me, was very, very brief … Exactly what have they tested for?”