Nine months after a 23-year-old student was fatally gang-raped on a moving bus in Delhi, a fast-track court will deliver its verdict on four of the six men who were arrested for a crime that shook India to its core, ignited street protests, and forced the introduction of tougher laws to punish sexual offences. If the four men are found guilty of rape and murder, they could face the death sentence. They have all said they are not guilty.