Andaman Islanders 'forced to dance' for tourists. Link to this video      They are holidays billed as an opportunity to enter another world, a  chance to see the world's last primitive tribes up close in their  natural environment.
The brochures tease and at times, critics  say, titillate. Take the Delhi-based Aces Indian Tours, which invites  visitors to travel to see the Bonda people, an ancient tribe found in  the remote hilly regions of the state of Orissa. The website breathily  offers to provide an insight into utterly different lives. "On the  northwest of river Machkund", it states, "live the wildest, rudest and  possibly the most interesting tribe known as Bonda Tribe. The scanty  dress of the Bonda women and homicidal tendency of Bonda males make them  most fascinating people."
It is this kind of exotic invitation that has now come under unprecedented scrutiny in 
India, raising ethical issues that also apply to similar tours in other remote regions of the world.
Every year, thousands of western tourists visit India in search of the exotic. But two weeks after an 
Observer investigation  exposed the degradation of "human safaris" in the Andaman Islands –  which are in Indian territory – the country's travel industry has  entered a bout of soul-searching. The 
Observer exposed 
video evidence  that Jarawa tribeswomen had been bullied into dancing for convoys of  visitors on the islands' main road. The reaction has been furious. Sonia  Gandhi, leader of the ruling Congress party, has taken a personal  interest in the 400-strong Jarawa's fate and is understood to be  frustrated by the lack of action to protect them. At a meeting last week  of the powerful National Advisory Council, which she chairs, members  denounced the "deplorable situation of the exploitation of the Jarawa  tribe".
The investigation has now prompted the home minister, P  Chidambaram, to demand the interrogation of those responsible. He has  flown to the Andamans to tell officials there to act swiftly to prevent  further abuse of the tribe. Tribal affairs minister V Kishore Chandra  Deo said: "It's deplorable. You cannot treat human beings like beasts  for the sake of money. Whatever kind of tourism is that? I totally  disapprove and it is being banned."
But what about elsewhere in  India, and in other parts of the world? In the case of the Jarawa, there  is little doubt that the tribespeople have been exploited by  unscrupulous locals and insensitive visitors. Elsewhere, ethical lines  are usually more blurred, but the risk of damaging contact with  vulnerable communities is very real.
In 1989, India introduced the  Scheduled Caste and Scheduled Tribe (Prevention of Atrocities) Act in  an attempt to protect indigenous communities from "indignities,  humiliations and harassment". But with the number of tourists across the  world expected to hit a billion this year and previously inaccessible  places beginning to open up for more and more people, how close should  travellers be allowed to come to vulnerable communities?
One of  the most popular destinations in India is Orissa, where tour operators  promise sightings of the insular Bonda when the tribespeople leave their  homes to go to a market in the village of Onkadeli. Entry into the  Bonda's own villages is illegal: the tribe do not invite attention and  many dislike being photographed, but the market offers a way to view  them, and the tours continue. Even the state tourist board uses images  of the tribe in its adverts.
Royal India Holidays, with offices in  India and the US, offers a tribal tour of Orissa where it promises  tourists can "see the lifestyle of tattooed, heavily beaded, nearly  naked tribal people, their day to day activity and their extremely  primitive way of living".
The company says it is recognised by  India's ministry of tourism. Its brochure describes a trip to the  Jeypore area of Orissa: "After breakfast, an excursion to the nearby  hills where most amazing and fierce Bondas Tribes (naked people) reside.  They are also known as Remo meaning 'people'. The Bonda are generally  semi-clothed, with the women characterised by the wearing of thick  silver necklace bands. The tribe is one of the oldest and most primitive  with their culture little changed in over a thousand years. The best  way to view members of the tribe is by going to local markets held every  Thursday."
Company owner Newton Singh told the 
Observer  that most tours in Orissa focused on the tribes. He said he believed  that the company was operating within the law but it relied on local  agents in Orissa. He said he understood the objections and would review  the tours. "I don't want to do anything against the laws of humanity,"  he said.
Bhubaneswar-based Dove Tours offers a tour of Orissa in  which, it explains, "the area we visit is the home of the approximately  6,000 members of the fierce Bondas (naked people). They live in the  remote hills and keep themselves isolated … They can only be seen when  they come to trade at the local market, and we must time our visit to  coincide with the weekly market day."
Gagan Sarangi, speaking for  the company, said it operated within responsible guidelines and only  dealt with tourists who would respect the tribe. He said foreign  tourists were barred from the Bonda's area, but it was still possible to  spot them in the markets. "We are totally against any kind of unethical  practices in the tribal area," he said.
Survival International,  which campaigns on behalf of tribal peoples, is sceptical that such a  high-minded approach is reflected by what takes place on the ground. The  charity's director Stephen Corry said: "We are now in the 21st century,  not the 19th. Colonialism should be a thing of the past. Tribes are not  cultural relics, nor should they be treated like animals in a zoo.
"They  are not ancient or backward, but adapting like everybody around us to a  changing world. This should entitle them to the same rights and  freedoms as the very tourists who are taking their photographs.
"Promoting  tours by using derogatory terms such as 'primitive', and advertising  their 'nakedness', shows a clear lack of respect."
Corry said tour  operators had no right to promote tribal people as a tourist  attraction. "Forcing them to dance in return for sweets and biscuits,  for the amusement of onlookers, is only possible where they're viewed as  somehow less than fully human," he said. "Sadly, the existence of human  safaris in the Andamans is not isolated, but replicated in other areas  of India. It is crucial tourists boycott such unethical 'attractions',  so there is no fuel in the market to drive such tasteless practices."
Association  of British Travel Agents spokesman Sean Tipton said the travel industry  recognised the necessity of regulating and monitoring interaction  between tourists and tribes. "Customers should always seek permission  before taking photographs of indigenous people, or indeed any local  people. This is a matter of courtesy and cross-cultural sensitivity."
Sue  Ockwell, for the Association of Independent Tour Operators, was also  keen to emphasise that its member companies were against the sort of  "tacky tourism" seen in the Andamans. "The aim of Aito is to ensure that  host destinations and local people at tourism destinations benefit from  tourism as well as those who take tourists," she said.
"Unfortunately,  exploitation does still occur – from child prostitution to the type of  practice described in the Andamans. It requires action by UK tour  operators and associations such as Aito and Abta and it also requires  action by governments in the destinations affected. It is only by  working together that this sort of business can be stamped out."
Clearly,  though, more needs to be done. Blogging about a visit to Onkadeli, one  tourist noted that the attention of tourists was clearly unwelcome to  some of the tribal people: "There were a few tourists around (including  myself) and truth be said, it all felt a little rude and intrusive! Some  of the adivasis [indigenous tribes] were clearly uncomfortable with  camera-wielding tourists, so I started to only take pictures with their  permission. This would almost always result in my having to part with 10  rupees [about 13p]!"
British travel firm Audley Travel, winner of  three Guardian-Observer travel awards for best small tour operator,  offers tours to Orissa in which it promises sightings of the Bonda  tribe, despite acknowledging that photographing them may be banned. The  company said it firmly advocated responsible tourism and only took  individuals or couples.
"They are accompanied by tour guides who  are well briefed on the cultural sensitivity of the situation,  particularly photography. Our clients themselves are intelligent,  informed travellers whose last intention would be to 'gawp' at local  people."
Meanwhile, in the Andaman Islands, police say they have  made some progress in identifying those responsible for filming the  video publicised by the 
Observer, which is now believed to have  been shot in September or October of 2008. "The police team is  questioning several tour operators and taxi drivers of the city in an  effort to track down the source of the video," said S B Tyagi,  superintendent of police. Officers have raided several shops in the town  in an attempt to seize videos of the Jarawa that have been circulating  among tour operators and which are sold to tourists.
Police announced on Thursday that a senior officer had been placed in charge of monitoring the road and said they had 
arrested two tour operators named in the 
Observer report.
The  lieutenant governor of the Andaman and Nicobar Islands, Bhopinder  Singh, has been ordered to take action to prevent further exploitation  of the Jarawa. Tribal affairs minister Krishna Chandra Deo described the  incident as "disgraceful and a shame on all of us" and said the tribe  should be treated as humans, not aliens.
As the country digests  the implications of the scandal, Corry said tourists considering  visiting tribal areas needed to think very carefully about the long-term  effects on tribal peoples, instead of the "fleeting thrill of the  experience or the glory of the story once back home".
 Tour  operators take  thousands of tourists to "spot" members of the tiny  Jarawa tribe, which  could be devastated by an epidemic.
Owned by Wilderness Safaris, this was built without consulting local bushmen, on whose ancestral lands the lodge sits.
 Treks to an area where tribes "have had no contact with the outside world".
 Guided visits to the Hadzabe create funds for various projects.
Lies in land of the Achuar people. Small groups are led by a bilingual guide and a native Achuar guide.
 Ecologically and culturally sensitive excursions.