Eleven people have been detained in Istanbul over the deaths of a Turkish-German tourist mother and her two children from suspected pesticide poisoning. Investigations point to hotel pesticide exposure, while the father remains in critical condition.

Istanbul: Eleven people have been detained in connection with the deaths of a Turkish-German tourist and her two children from suspected poisoning in Istanbul, the state-run Anadolu news agency said Monday.

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The woman, her husband and their two children, who were on holiday from Germany in Turkey's largest city, fell ill on Wednesday after eating several popular street food dishes in the waterside neighbourhood of Ortakoy, at the foot of a bridge spanning the Bosphorus.

They were taken to hospital but the two children died on Thursday and the mother a day later. Anadolu identified the victims as Cigdem Bocek, her son Kadir, six, and her daughter Masal, three.

The father, Servet Bocek, is fighting for his life in intensive care.

Istanbul prosecutors opened an investigation, initially focused on suspected food poisoning.

But evidence has since emerged that the family may have been exposed to pesticides in the hotel where they were staying, Turkish media reported.

Quoting investigators, Turkey's Hurriyet newspaper said a substance was sprayed in a room on the ground floor of the hotel to combat a bed bug infestation, which may have reached the family's room on the first floor through a bathroom vent.

The unnamed hotel in the Fatih neighbourhood near Istanbul's historic peninsula was evacuated on Saturday after two more guests were taken to hospital with similar symptoms, Anadolu said.

The hotel was sealed off by municipal officials on Sunday, the agency added.

Among those detained were five food sellers, the hotel's owner and two staff, and three people from the pest control company, it reported, without giving a timeline for exactly when they were all detained.

Eight of them were to appear before a judge on Monday.

A toxicology report prepared by forensic experts was expected to be released later on Monday, along with a report on the food samples being checked by experts at the agriculture ministry, Anadolu added.

The mother and her children were buried on Saturday at a ceremony in their family village in the Bolvadin area of central Turkey, about 240 kilometres (150 miles) southwest of Ankara, several Turkish newspapers reported.

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