Four persons, including a police constable and a homeguard, have been arrested in this connection, they said.
The incident occurred at the bus stand at around 1 AM when the woman was apparently waiting for a bus, Mahabubnagar SP D Nagendra Kumar told PTI over phone.
He said constable Seenu and homeguard Nagendran were apprehended along with two private employees identified as Ramesh and Rakesh based on information.
The victim was sent to a local hospital for medical examination and the four accused were booked under relevant provisions of recently-enacted Criminal Law (Amendment) Bill-2013 and section 376 (B) of Indian Penal Code, the SP said.