"The patient is currently struggling against the odds, and fighting for her life," he said about the young woman who was taken in an air-ambulance from New Delhi's Safdarjung Hospital to Singapore.
Left virtually for dead with her male friend on the road by the six males who raped her in a moving bus, she was so grievously injured that her intestines had to be taken out.
All six have been arrested for the crime, and both Manmohan Singh and Sonia Gandhi promised quick justice.
"You have my assurance that our government is committed to bringing the guilty to justice as soon as possible," the prime minister told reporters at the Congress headquarters in New Delhi on the occasion of the party's foundation day.
Wishing the woman speedy recovery, Gandhi said no time should be lost in punishing those responsible for the crime.
"Our wish is that she recovers and comes back to us... and no time is lost in bringing the perpetrators of the crime to justice," Gandhi said in her first public statement on the incident that has led to searching questions on the status of women in India, the crimes against women and the legal framework to address incidents of sexual assault.