The accused, aged around 20 and 28, were arrested last evening.
The incident took place on August 17 when the woman was returning to her house after she had gone to her friend's place to inquire about her son who had not returned home, PSI R A Bore of Manor police station said.
Later, the duo threatened the woman of dire consequences if she narrated her ordeal, he said.
Following a complaint by the victim's family yesterday, a case under section 376(d) (gangrape) and 506 (criminal intimidation) of IPC was registered, the officer said, adding investigations are underway.