Competitors report falling ill after triathlon event in waters of river Eden

Investigation begins as people complain of diarrhoea and vomiting after swimming in Hever Castle's lake

The organisers of a triathlon on a lake fed by the River Eden in Kent have launched an investigation after a number of competitors fell ill with diarrhoea and vomiting.

The Castle Race Series, organisers of the triathlon and other competitions at Hever Castle last weekend, said rigorous tests in the days and weeks leading up to the event had indicated the water was safe to swim in.