An 18-year-old man was sentenced to three years in jail for the brutal December gang rape of a young woman on a moving bus in New Delhi, India, that sparked worldwide outrage.

The conviction of the man in juvenile court was the first in the case, which left the 23-year-old victim with internal injuries so extensive, she died two weeks after the attack.

The victim’s mother, Asha Devi, was outraged by the sentence.

“He should be hanged,” she told reporters.