Telangana home department has decided to beef up security for chief minister K Chandrasekhar Rao by procuring a new bulletproof bus after Maoists threatened to target   TRS leaders following the killing of 10 guerrillas in an encounter on the Telangana-Chhattisgarh border last week. The bus, to be procured by the roads and buildings (R&B) department, will have state of the …