According to the police, the thieves struck at the house of one J P Vinayak, a resident of Bagdola village near Dwarka sector 8 on Sunday Night. He lives with his wife Jagdish, a son and a daughter.
"The incident took place on the intervening night of Sunday and Monday when Nayak heard his wife's screams for help. When he rushed to her, he was confronted by four armed men. The robbers tied both of them with a bed sheet.
The robbers searched the whole house for around three hours for cash and jewellery and finally fled at around 5 AM, police said.
The family informed the police who took them to hospital for treatment. An FIR has been lodged and investigations are on, said a police official.