Though the offence took place in the city on January 19, it came to light today when Pendurthi police nabbed the four accused in the case.
According to police, the woman, a native of city's Pendurthi area, had lost her husband about two years back and was working at a shop for livelihood.
On January 19 evening, the woman along with her friend S Naidu was walking towards her home where four persons - K Ramana, P Ramesh and their friends A Vara Prasad and P Mahesh - posed as policemen before her.
The four accused then warned the woman and Naidu not to inform police about the incident and fled from the spot.
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The victim approached Pendurthi police on January 23 and lodged a complaint.
Based on the complaint and the information provided by the victim, a police team nabbed accused K Ramana a few days back.
During the interrogation, Ramesh disclosed the names of three others accused in the crime who were arrested today.
Assistant Commissioner of Police (North) CM Naidu said all the four accused have been booked under section 376(D) of IPC.
Both Ramana and Ramesh were involved in several theft cases in and around Pendurthi area, the ACP said.