The family of Sanskriti Sinha, a young aeronautical engineer who was crushed to death under mysterious circumstances at the domestic airport in New Delhi, demanded a Central Bureau of Investigation (CBI) probe into her death on Wednesday.

Sanskriti, a native of Patna, who worked with private airlines Air Deccan in New Delhi, was run over by a heavy vehicle while she was moving towards the hangar to attend to some engineering requirements late on Monday, a police official said. Her head was completely crushed.

The airport manager found Sanskriti's body at around 10.30 pm on Monday near the taxiway and informed the police. The report of Sanskriti’s post-mortem examination revealed that she was crushed under a heavy vehicle as there were wheels marks on her head. She was in her 20s.

Sanskriti’s family here is in a state of shock and has alleged foul play behind her untimely death. They want a CBI investigation. “A CBI probe will expose the truth behind her tragic death,” said Arun Kumar Sinha, Sanskriti's father.

“Do you think it is possible that someone could drive a vehicle so rashly and at such high speed in this sensitive zone where the speed limit is restricted to 20 kmph?” Kumar had asked on Tuesday. He is a senior lecturer at a government college near Patna.

“It can't be an accident as the authorities and the police are yet to trace the killer vehicle. Someone has deliberately killed my daughter,” a grief-stricken Kumar said. “We would like to know how an on-duty staff was crushed to death and why Air Deccan authorities have failed to provide a cause of her death. A CBI probe is the only solution now,” said Tushar, the victim's elder brother.

Her family has questioned the report that nobody saw the vehicle that had hit their daughter despite tight security arrangements at the airport.

“Delhi police, airport authorities and Air Deccan are silent on the issue,” Kumar said. Sanskriti was to get engaged next week to a software engineer in Bangalore.