CARTER COUNTY, Okla. -- A series of explosions at a Carter County oil well site shut down a state highway and prompted evacuations.

It happened after 6:00 pm Thursday near the Clemscott Community.

Authorities say a live well, a tank battery, and a hot oil transport truck all ignited.

We're told flames could be seen for miles before firefighters arrived.

Three homes were evacuated as a precaution.

Fire crews from Fox-Graham, Ratliff City, Healdton and Wilson responded.

Ratliff City Police Chief Robert Thornton says one firefighter was treated for heat exhaustion.

Residents were allowed back home around 8:30 pm Thursday.

No word on a cause.