It happened around 8:30 p.m. on Wednesday at Xtreme Off-Road Park on Gulf Pump Road.
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In a tweet posted by the Harris County Sheriff Ed Gonzalez, the boy went under water in the swimming area.
He has since been sent to the hospital in serious condition.
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According to Harris County Dep. Kimberly Thomas, the family was at the park to enjoy the day.
The incident remains under investigation.