A three-year-old girl was raped and a wooden object inserted into her private parts by unidentified assailants here in the national capital, police said on Sunday.The minor girl was in critical condition after having undergone surgery at the Safdarjung Hospital.A case has been registered against unknown people in south Delhi's Sarojini Nagar police station, and efforts were on to identify the accused, police said.According to police, the girl, who lives with her parents in a slum cluster in Pilanji village near Sarojini Nagar, was lured and raped at an isolated plot on Saturday night.The incident came to light when the girl was seen crying near her house, and found to be bleeding.