Six policemen were killed when Naxalites attacked with hand grenades their camp at Venkammanahalli in Pavagada taluk of Karnataka's Tumkur district in the early hours of Friday, a senior police official said.

The Karnataka State Reserve Police personnel were staying in a school building, Karnataka Director General of Police S N Borkar told PTI.

"It is definitely the handiwork of Naxalites," he said.