The Downtown YMCA in Durham sodium hypochlorite reported a leak of sodium hypochlorite in their swimming pool. The chemical is commonly used as a disinfectant. Durham County spokeswoman, Dawn Dudley, said the chemical is used for “everyday maintenance” of swimming pools, according to the Charlotte Observer.

Dudley said 39 people were in the pool at the time of the leak. The children were taken to Duke University Hospital or Duke Regional Hospital. The six who were listed as being in a critical condition were taken to a local hospital, police spokesman Wil Glenn said.

“Thirty-four additional children and two adults were transported with non-serious injuries,” he added.

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