KOCHI: Infopark police have registered a case against a doctor at a prominent hospital in Kochi for allegedly sexually assaulting a woman.The case was registered against Dr Johnson Varghese, who had earlier filed a complaint alleging that he was threatened and robbed. He claimed that 12 people attacked him between 6.30pm and 10.30pm on Monday.In his complaint, the doctor alleged that one of the accused, a woman actor, contacted him and asked him to visit a third-floor flat in an apartment complex in Ponnurunni, Vyttila. He was reportedly told that the aunt of one of the accused was seriously ill and required urgent medical attention.He alleged that the group then accused him of administering narcotic substances and sexually assaulting the aunt.The doctor further alleged that the group attacked him and robbed him of valuables, including two mobile phones and a smartwatch, collectively valued at around Rs 3.25 lakh. The stolen items were yet to be recovered.The case against the doctor was registered a day after police arrested three people, including two actors, based on his complaint.