NEW DELHI - Indian police has arrested four men on charges of gang-raping a US tourist in New Delhi in March this year.

"On Monday, we arrested the four suspects -- a tour guide, a driver, a tourist bus helper and a hotel employee -- in connection with the incident after the American woman flew down to the Indian capital and filed a police complaint on Dec 3," a senior police official said.

The woman did not approach the Delhi Police soon after the incident in March as she had gone into depression and went back to America.

The woman claimed that she had come to Delhi on a tourist visa in March this year and was staying at the hotel when the incident took place. The tourist guide and his four friends came to the woman's room one day, shared drinks with her and then took turns to rape her.

"We will ensure that the perpetrators of the heinous crime get the strictest punishment and charge-sheet will be filed as soon as we get all the evidence," the police official said.

This is not the first case of gang rape of a foreign national in the Indian capital. In January 2014, a Danish woman was gang-raped by a group of men at knifepoint near the New Delhi railway station.

Scrutiny of sexual assaults in India has grown since the 2012 fatal and brutal gang rape of a 23-year-old medical student by six men on a moving bus in the national capital.