The incident occurred around 6 pm in a ghat section under Dhone sub-division, they said.
"The truck hit the stationary stone-laden tractor from the back side. Due to the impact, the tractor fell into a 25-feet gorge. Four persons sitting atop the stones, died on the spot, while one more died on way to hospital," Deputy Superintendent of Police P N Babu told PTI over phone.
The victims worked at a cement factory, the DSP, who is supervising the rescue and relief operation, said, adding, the matter is being investigated.