An athlete competing in the World Championships has been quarantined after a vomiting bug has hit an official hotel, event organisers have anounced.
Botswana's Isaac Makwala and Irish athlete Thomas Barr both had to pull out of events after coming down with gastroenteritis.
400m hurdler Barr was quarantined away from the rest of the Irish squad at the Guoman Tower Hotel to avoid passing on the illness, the Mirror reported.
"I'm gutted...my whole year has been focused on the World Championships," Barr said. "Not being able to go out and compete...is beyond disappointing."
Makwala, who is among the favourites for the 400m, withdrew from the 200m heats.
He wrote on Facebook: "Badnews guys !! Reason for not starting 200m earlier this evening. According to IAAF medics I am apparently suffering from food poisoning which has affected several other athletes in the athletes' hotel."
The BBC says 30 athletes and support staff have been affected - many believed to be Canadian and German - and that 30 German athletes have been diverted to a different hotel.
Gastroenteritis is a very common condition that causes diarrhoea and vomiting.
Cases in adults are usually caused by norovirus (the "winter vomiting bug") or bacterial food poisoning.
A Tower Hotel statement said environmental health and the International Association of Athletics Federations (IAAF) investigations had shown the hotel was "not the source of the illness".
A statement said: "We have followed strict hygiene protocol, ensuring that those affected are not in contact with other guests and all public areas have been thoroughly sanitised."
Organisers of the World Championships confirmed other athletes staying at the same hotel had also fallen ill.
A statement from London 2017 said: "There have been a number of cases of gastroenteritis reported by team members residing within one of the official team hotels for the World Championships.
"Those affected have been supported by both team and LOC (local organising committee) medical staff, in addition we have been working with Public Health England to ensure the situation is managed and contained.
"As a result, further advice and guidelines have been issued to team doctors and support staff - standard procedure for such an occurrence where a number of teams are occupying championship accommodation."
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