TULSA, Oklahoma - A Tulsa firefighter was treated for heat exhaustion at the scene of an apartment fire Wednesday.

Investigators are still looking for the cause of that fire at the Pecan Creek Apartments in the 6100 block of South Yorktown.

 Firefighters arrived to find heavy smoke pouring from the apartment.  

The fire department says no one was found inside the apartment during a search.   

They say the firefighter was treated and released from the hospital.