Seven students were injured Wednesday morning when a West Virginia school bus hit a tree, officials said.

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One student was in serious condition and will need surgery due to internal injuries, but the other injuries appeared to be minor, Putnam County Sheriff Bobby Eggleton told news outlets.

A school bus in Florida

The rear exit of a school bus is photographed. (Joe Raedle/Getty Images)

It appears the bus driver experienced a medical emergency that led to the crash, Eggleton said. The driver also was taken to the hospital, but an updated condition wasn't available.

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The children appeared to be elementary school students, officials said.