Nearly 60 people fell ill after taking part in the swimming portion of events at the World Triathlon Championship Series in Sunderland at the weekend.

As the Guardian reports, at least 57 triathletes out of some 2,000 who took part in the open sea swimming portion off Roker Beach in the north-east of England came down with symptoms that ran from upset stomachs to diarrhoea.

While organisers British Triathlon say its water quality testing results passed acceptable standards, an Environment Agency sampling from nearby waters three days before the event reportedly showed highly elevated level of E. coli.

The Roker Beach area on the North Sea coast has been at the centre of a lengthy dispute between campaigners and the UK government over sewage discharges, though the local water supplier denies there was any incident that would have affected water quality over the weekend.

No such illnesses were reported after the 93rd Dun Laoghaire Harbour Race, which took place on Sunday (6 August). Clodagh Sweeney of Sandycove was first among the women, while Colm Leonard of the Phoenix Swimming Club won the men’s race. Full results can be found HERE.