The incident took place in the wee hours, around 80 kms from here on the Telangana-Chhattisgarh border, Eturunagaram Police Circle Inspector Ravi Chandra said.
A note, purportedly penned by one Damoder, secretary of Khammam, Karimnagar and Warangal district of the outlawed CPI (Maoists), was found on the spot, he added.
As per the note, several allegations were made against the Central and the state government, the inspector said.
Warangal Rural Superintendent of Police Ambar Kishore Jha will be visiting the spot to take stock of the situation.