LONDON, United Kingdom — A number of athletes at the IAAF 2017 World Championships in London have been reporting upset stomachs with the latest athlete being Botswana’s Isaac Makwala.

Makwala on Monday said he was forced to withdraw from the 200 metre heats because of food poisoning.

According to the Telegraph, London 2017 organisers released a statement late on Monday saying that a number of teams had reported cases of gastroenteritis at their official hotel.

“Those affected have been supported by both team and LOC medical staff, in addition we have been working with Public Health England to ensure the situation is managed and contained,” the organising committee said in a statement.

“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.”

It was not immediately clear if Makwala, who pulled out of the 200m heats earlier on Monday, was staying at the hotel in question but he said on his Facebook page that other athletes in his accommodation had been ill.

“According to IAAF medics I am apparently suffering from food poisoning which has affected several other athletes in the athletes’ hotel,” he wrote on his Facebook page.

“Let’s hope they will allow me to run my final tomorrow.”

Makwala, among the favourites for the 400m, would normally be scratched from the final after pulling out of another event.

As he missed the heats on medical advice, however, he would be able to run, if fit.

Ireland’s 400m hurdler Thomas Barr was also forced out of his semi-finals on Monday.