A former director of National Council of Educational and Research Training (NCERT) and his family were held hostage at gunpoint and robbed at their house in the posh Dayanand Vihar area of east Delhi on Friday.
Police said four masked men drilled a hole in the wall of a nearby park to gain entry into the gated colony where they targeted the house of GR Gambhir (68).
A fortnight ago Pushpa Dhawan (65) and her son Anil were held hostage and robbed in a similar manner in the same colony. Police suspect that both the cases are the work of the same gang. Friday's incident was reported at 4.30am.
"The accused drilled a hole in the nearby park and entered the colony. After that they broke open the rear door of the house and held all the four members of the family at gunpoint before fleeing with their valuables," said IB Rani, deputy commissioner of police (east).
Gambhir's son Tarun is an engineer with Wipro Technologies and his daughter Neeta is a schoolteacher.
Police said the robbers stayed in the house for around one hour and even disconnected the phone line connection so that the family could not immediately call the police.
They also took away their mobile phones.
The Gambhirs told the police that the accused were wearing monkey caps and were carrying country-made weapons.
"There was not much cash lying in the house so they fled with electronic items like laptops and cameras. When I resisted their attempts, one of them attacked me with a knife," said Gambhir.
Police said they have registered a case of robbery and were looking into the case. "No one heard them drill a hole in the wall as the accused are professionals," said the officer.
Police said they were conducting raids to ascertain the identity of the accused as in both the cases senior citizens were targeted. The police also said the accused had specific information.