Raipur, July 26 - Two troopers were killed and four injured late Sunday when Maoist guerrillas ambushed two paramilitary vehicles and triggered a powerful landmine blast in Chhattisgarh's restive Bastar region, police said.

Over two dozen Central Reserve Police Force (CRPF) troopers were in the vehicles when a landmine hit one of them and damaged its front portion in Dantewada district, some 350 km south of capital Raipur, said Deputy Inspector General Pawan Deo.

Six injured CRPF men were rushed to a hospital in Dantewada where two of them succumbed to their injuries, he said.

'The blast was targeted for a massive casualty but it hit only one vehicle.