Indian investigators examine the bus where a 23-year-old New Delhi woman was brutally gang raped and beaten last December.
The trainee physiotherapist later died of her injuries, sparking national calls to protect women.
Months later, Indian courts are set to decide the fate on Tuesday of four men accused in the attack.
Police say DNA tests have linked at least two of the men to the crime, one of whom tried to kill himself while in custody.
All could face the death penalty.
Last month a teen boy involved in the assault was sentenced to three years in juvenile detention for his part.
The case has raised questions over women's safety here, as another gang rape report surfaced in August, this time involving a young female photojournalist in Mumbai.
Social activists say most sex crimes go unreported, while offenders escape justice.
Indian women face a number of threats, including forced marriage, rape, dowry-related murder, domestic violence and human trafficking.