MALKANGIRI (Odisha): The mastermind of the 2013 Maoist massacre of nearly 30 senior Congress leaders in Chhattisgarh's Bastar district was killed in an encounter in Odisha's Malkangiri district on Saturday.

Sonadhar , who was the brain-behind the killing of former Union minister VC Shukla , Mahendra Karma and several other top leaders of Congress in Chhattisgarh on May 25, 2013, was killed along with two of his body guards in Malkangiri district.

On a tip-off, a team of Special Operation Group (SOG) and District Voluntary Force (DVF) launched an operation in Bhejaguda forest of Mathili area where they came face to face with a group of ultras, sparking a gunbattle, Malkangiri superintendent of police Mitrabhanu Mohapatra said.

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Three Maoist rebels — Sonadhar, the Darbha (Chhattisgarh) Maoist division area committee secretary, and his two body guards — were killed in the encounter while several others fled, he said.

In the 2013 incident in Chhattisgarh's Darba Ghati before the state assembly polls had wiped out almost the entire Congress leadership in the state. Karma, a former home minister of Chhattisgarh, was the spearhead of Salwa Judum, an anti-Naxalite operation. They were among 25 people killed in the Maoist ambush.

Sonadhar, who held an important position in Maoist hierarchy, was allegedly involved in many crimes in Mathili area in Odisha and adjoining Darabha region in Chhattisgarh, police said.

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A pistol, some sharp weapons, walkie-talkie sets, Maoist uniforms and several other Naxalite materials including literature were recovered from the site of Saturday's encounter.

Combing operations and patrolling have been intensified in the area after the incident, they said.