The incident occurred on Saturday night when the woman was sleeping inside her shanty. The door was open since she was waiting for her son to arrive, they said.
The 35-year-old accused, who stays in the same neighbourhood, entered her shanty in a drunken state and sexually assaulted her, the police said.
After sexually assaulting her, he threatened her of dire consequences if she reported about the matter to anybody.
Initially the woman was not comfortable about filing a police complaint and it was only after she narrated her ordeal to her daughter that she was brought to the police station and a rape case was registered, the police said.
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The accused was lodged in jail in connection with a theft case but was out on bail.
He was produced before a court that sent him to judicial custody.
The woman is being counselled by an NGO, the police added.
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