GUYANDOTTE, West Virginia (CNN) -- Seven people were treated at a hospital after inhaling chlorine fumes that spilled from a CSX freight train that derailed Saturday near the Ohio River just north of the town of Guyandotte.

Residents living within a one-mile radius of the accident were either evacuated or told to stay inside their homes after 30 freight cars jumped the tracks, spilling several chemicals -- hydroxide, formaldehyde, hydrochloride acid, multon sulfur and chlorine.

The accident occurred about 50 yards from the river, but officials say none of the chemicals spilled into the waterway, which was closed for about 40 minutes and then reopened.

Andy King, nursing supervisor at Saint Mary's Hospital in Huntington, two miles south of Guyandotte, said none of the injuries appeared life-threatening.

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