NEW DELHI: Britain and France have revised their travel advisories for India to warn visitors about the risk of sexual attacks following two new rape cases involving German and Danish tourists in recent weeks.

A 51-year-old Danish tourist was robbed and gang-raped at knife-point in New Delhi on Tuesday after she lost the way back to her hotel and stopped to ask directions near the backpacker's area of the city.

A day before, an 18-year-old German charity worker told police in southern India she had been raped on an overnight train by an Indian passenger.

“Women travellers should exercise caution when travelling in India even if they are travelling in a group,” the British advisory posted on the government website said.

The French foreign office also advised its citizens to exercise “utmost caution” in an advisory updated on Thursday “Several recent incidents show that foreign women or expatriates can be the victims of such incidents in India,” it said.

In early January, a 33-year-old Polish woman was allegedly drugged and raped as she travelled to the Indian capital in a taxi with her two-year-daughter.

The series of attacks have shone a fresh spotlight on the country's record on sexual violence and its reputation as a dangerous destination for foreign female travellers.

On Friday, police in southern Chennai said that a 22-year-old carpenter arrested over the rape of the German traveller had been remanded in custody for 15 days.

The teenaged victim told police she had taken an overnight train on January 10 from the southern port of Mangalore to Chennai and was sleeping on a lower berth when she was attacked by a fellow passenger.

In the Danish gang-rape case, three men have been arrested and police are seeking another five suspects. —AFP