More than seven years after a 23-year-old medical student was gang-raped in a moving bus in Delhi, four men convicted for the brutal assault were hanged this morning. The four men -- Akshay Kumar Singh, Pawan Gupta, Vinay Sharma and Mukesh Singh -- were hanged at 5:30 am at Delhi's Tihar Jail, hours after the Supreme Court, in a midnight hearing, refused to grant them relief and stay their executions. The four were hanged simultaneously, a first in Tihar Jail's history.