"The woman was raped and murdered on yesterday in an isolated under construction building on the outskirts of the city," Deputy Commissioner Police (DCP) Harjinder Singh Sidhu said.
She was strangled to death with her duppata (scarf) by more than one person in the abandoned building located in Baba Deep Singh Colony falling in Nangli village on the Fatehgarh Churian road, Sidhu said, adding that her parents recognised the body.
Her body was first noticed by children of the area when they went inside the building to play and raised alarm, police said.
The DCP said it was a planned murder and police have got "vital clues" about the murderers who are at large.
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Circumstantial evidences indicated that the accused were in the influence of liquor at the time of crime, DCP said.
Police have also found used condom from the spot of crime, Sidhu said adding that the body has been sent for autopsy.