Security personnel, who reported no damages or injuries, however, could not nab any of those involved in the attack although they said it is suspected that at least a couple of the ultras had received injuries.
Naxals might have borne away their injured colleagues with them while retreating from the encounter, police added.
Three rifles, some supplies and items of daily use were recovered from the spot.
The incident occurred when a joint team of police forces from the districts of Rajnandgaon, Balod and Kanker was conducting a combing operation in the jungles of Durki hills in the Khadgaon police station area, Rajnandgaon SP Sanjeev Shukla told PTI.
The combing operations were on the past four days, the SP added.