Four civilians were on Sunday killed when suspected Naxals blew up a truck in a landmine blast in Chhattisgarh's Dantewada district, police said.

Naxals blew up the truck near Keralapal village in the district, killing all the four persons travelling in the vehicle on the spot, Superintendent of Police, Dantewada, Amresh Singh said.

The truck had left Doranapal village in the district for Sukama with truck's owner Surya Narayan Raju and three labourers. As it reached near Keralapal village on NH-221, Naxals triggered landmine blast, he said.

Police was trying to ascertain the identity of victims, Singh said.