Indian police have rounded up a group of men over the alleged gang-rape of a 51-year-old Danish tourist who lost her way near the backpacker's area of New Delhi, officers said.

The woman approached the suspects for directions yesterday evening while trying to return to her hotel in the bustling Paharganj area of the capital, reportedly after visiting a city museum.

Six men armed with a knife allegedly assaulted and then robbed the woman, who was travelling alone and had been in New Delhi since Monday after visiting the Taj Mahal.

Special Commissioner of Police Deepak Mishra said: "We have detained a group of men and we are questioning them over the incident.

"The woman reported the attack to police and we are investigating."

The alleged attack, which was just minutes from Connaught Place in the heart of the capital, is the latest involving a foreigner in India.

It again raises questions about the safety of women in the world's second most populous country.

Mr Mishra declined to say exactly how many men had been detained over the incident near New Delhi Railway Station, but local media put the number at 15.

The case comes after a Polish woman was allegedly drugged and raped by a taxi driver earlier this month while travelling with her two-year-old daughter to New Delhi.

Last month, India marked the first anniversary of the death of a student who was gang-raped on a moving bus in the capital in an attack that sent shockwaves across the nation.

Protests over the attack prompted India's parliament to toughen laws for rapists and other offenders, while other judicial and police reforms that have encouraged women to report attacks have also been introduced.

But daily accounts of brutal assaults continue to be reported in the country's newspapers.

A schoolgirl was raped by eight men in the eastern city of Ranchi this week while they held her male friend, the Hindustan Times reported today.

A judge last month sentenced three Nepalese men to 20 years in jail for the gang-rape of a US tourist in June in the northern state of Himachal Pradesh.

Six men were sentenced to life in prison last July for the gang-rape and robbery of a 39-year-old Swiss woman cyclist who had been holidaying in the central state of Madhya Pradesh.