A Indian woman who was the victim of a gang rape and brutal beating earlier this month in New Delhi has been flown to Singapore for further treatment.

The 23-year-old arrived at Singapore's Mount Elizabeth Hospital early Thursday.

B.D. Athani, medical superintendent at the Indian hospital where she had been treated, said the woman has already undergone three operations and remains in critical condition.

“Based on the advice of a team of doctors, the government of India has made arrangements that the patient be shifted in a well-equipped air ambulance to a renowned hospital identified by the doctors, involving minimum journey so that she can be provided with state-of-art medical treatment that may perhaps stretch to many weeks.”

He said the hospital in Singapore has an advanced multi-organ transplant facility, and that arrangements have been made for the woman's family to accompany her there.

She was traveling on a charter bus December 16 when a group of men on board raped and beat her with an iron rod and then threw her from the bus.

Police have arrested six alleged attackers, who are accused of rape and attempted murder.

Indian authorities have launched a special investigation into the attack, which sparked widespread protests in New Delhi urging the government to address crimes against women.

One panel will review the police response to the attack, while another will suggest ways to make the capital safer for women as well as changes to the law to create stiffer penalties for such crimes.