Three Central Reserve Police Force commandos have been killed and over a dozen injured after multiple encounters took place between security forces and Naxals in Chhattisgarh's worst Maoist violence-affected Sukma district.

Officials said while two commandos, identified as constables Linju N and Fateh Singh had succumbed to their bullet injuries on Thursday, their colleague Lakshman Singh died today.

At least 15 others, including Commando Battalion for Resolute Action comamnder P S Yadavand the chief of the state polices' District Reserve Group, have been injured in the encounter which ended early today.

The patrol squad that came under fire yesterday noon inthe jungles of the district, has been brought to the Kistaram police station from the encounter site of Dabbanarka in Sukmaearly today by multiple Mi-17 helicopter sorties, they said.

Inspector General (Bastar range) S R P Kalluri and Sukma superintendent of police D Shravan are camping at Kistaram, about 500 km from the state capital to monitor the operations, they said.

The others who sustained bullet and splinter injuries include assistant commandant Yogendra, sub inspector Rajveer Singh, head constable Santosh, constable Sona Ram and some menof the DRG.

The encounter began when pesonnel of CRPF's exclusive jungle warfare unit CoBRA had the first exchange of fire with Maoists in the jungles of Bastar area.