Patna: An orchestra dancer was allegedly gang-raped by two men after being lured to a birthday party on the pretext of performing at a rented house in Nalanda district late Saturday evening. Police have arrested four youths and launched raids to arrest the remaining suspects.According to the woman’s statement, she and another dancer were offered money to perform at the party and taken to the venue through a middleman. Seven men were present when they arrived. During the programme, the other woman left the house, leaving the survivor alone with the men.The woman, 22, alleged that two men threatened and sexually assaulted her one after the other.Sadar sub-divisional police officer (SDPO) Amarnath said, “Eight people were allegedly involved in the incident, with two committing the assault and the others assisting them.”Police received information around 7am and reached the spot. A Forensic Science Laboratory (FSL) team examined the rented accommodation and collected samples.An FIR has been registered under relevant provisions of the Bharatiya Nyaya Sanhita (BNS), and an investigation is underway. The woman was taken to Model Hospital for medical examination. The other woman has also been brought under police supervision to record her statement.Station house officer (SHO) Anil Kumar Pandey said, “We have received information about the incident and are conducting a thorough investigation. All those found involved will be arrested at the earliest and appropriate legal action will be taken against them.”