Bangladeshi author Taslima Nasreen has written an open letter to her friends in Kolkata describing how she is living virtually under house arrest in a safe house in Delhi. In the letter, distributed at a literary fair in the city on Thursday, Taslima says she doesn't even know the address of her current residence. Taslima was forced to leave Kolkata in November after protests against her novel Dwikhandito by a section of the Muslim community.