UPDATE: A resort spokesperson says the park reopened at 6 p.m. The spokesperson says the ventilation system is working and the unidentified odor odor that prompted the evacuation is gone.

Emergency crews were called to Wilderness at the Smokies Waterpark Resort and an indoor water area was cleared Saturday afternoon.

Resort spokesperson Josh Bahe says a preventative maintenance was being done on some slides when a chemical odor was noticed and prompted an evacuation at Wild WaterDome Indoor Water Park. Bahe says the resort is working with the fire marshal to make sure the dome is ventilating properly.

A lifeguard said guests and lifeguards were developing red, watery eyes and began coughing and some lifeguards vomited.

NOTE: A previous version of this story stated a chemical leak caused the evacuation. A park spokesperson said the park cannot confirm a leak but does say a chemical prompted the evacuation.