A 42-year-old man was arrested for raping his daughter, now 16, since the last four years, said police Saturday.
The matter came to light when the accused attempted to rape his elder daughter.
Ram Awtar was arrested Friday for raping his younger daughter for four years and attempting to rape his elder daughter (19).
Awtar's younger daughter told her mother about it when her father attempted to rape her elder sister Friday night when she was alone at their home in east Delhi's Karawal Nagar.
The mother approached police and the accused was arrested after the medical report of the victim confirmed rape.