Smoke drifting north from the fire, which was possible because the state's lifted a burn ban following recent rainfall, prompted calls to Durham 911 about a possible blaze on the south side of the county.
The Durham County fire marshal's office said there was no cause for alarm, but firefighters were sent on at least one call before officials determined what was happening.
Durham officials said they believed the burn covered about 150 acres. Chatham officials were not immediately available.
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