A police official was injured on Thursday after the driver of a car carrying ganja knocked him down while trying to escape a vehicle check in Vikarabad district.
The incident happened at Anantagiri Hills at around 2 am, police said.
On seeing the police check, the driver suddenly reversed the car and hit Sub-Inspector K Krishna.
The SI suffered fracture in his left leg and injuries on his right leg, they said adding he was admitted to a hospital here.
The four occupants of the car including two engineering students from Hyderabad who were proceeding to Vikarabad were taken into custody, they said.
A case was registered for attempt to murder and under relevant sections of the Narcotic Drugs and Psychotropic Substances (NDPS) Act.