Chhattisgarh, May 7 -- More than 15 Naxalites were killed in encounter with security forces in Chhattisgarh's Bijapur district on Wednesday.

On Tuesday, a woman Naxalite was killed in an encounter with security forces in the same district.

The ongoing operation, said to be one of the biggest counter-insurgency actions launched in Bastar region, involves personnel of the District Reserve Guard, Bastar Fighters and Special Task Force, all units of the Chhattisgarh police; Central Reserve Police Force (CRPF) and its elite unit CoBRA, among others.

The operation was launched following inputs about the presence of senior cadres of the 'battalion number 1 - considered to be the strongest military formation of the Maoists - and leaders of the...