 Doctors and nurses rushed to the scene to tend to the sick, the closest hospital activated its emergency plan and the building was evacuated.There were reports of children "screaming" and a parent who witnessed the event from the viewing gallery stated that "a green liquid spray[ed] into the pool".One mother, whose son was infected, said "he saw a dark brown fluid coming out in the pool under water" and described the children as "sick, coughing and vomiting".