Five Florida children were taken to a hospital after being exposed to chlorine gas during swimming lessons, authorities said.

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Just after 7 p.m. Monday, a Hillsborough County Fire Rescue team was called to Calypso Pool in Tampa, according to Hillsborough County Fire Rescue.

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The children were treated at a local hospital for stomach discomfort and nausea but are said to be OK, according to WFTS.

Calyposo Pool’s owner claimed an afternoon thunderstorm caused a breaker to trip one of the pool pumps, so the water stopped circulating and chemicals built up in the pipes, according to the fire rescue team.

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When the pump turned back on, it caused a chemical reaction that allowed approximately 2.5 gallons of a chlorine mix into the pool, the fire rescue team said.