Police today arrested four persons including the man who had allegedly committed the crime.
All the four are natives of Nellore district in Andhra Pradesh, an official said.
The main accused, identified as Vamshi Krishna Reddy (32) is into real estate business along with three others.
"Reddy had boarded a room in the hotel. At around 3 am on the intervening night of August 15 and 16, he allegedly raped the woman by threatening her with a lighter resembling a gun. Three of his associates had also threatened the victim and her friend and helped Reddy to commit the offence," the official said quoting the complaint.
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Srinivas said the woman had come to Hyderabad along with another woman and a man to visit various tourist spots in the city, and all of them were staying in two rooms at the hotel.
Police have registered a case on the charges of rape and under other sections of the IPC.
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