The UK protesters are Iain Thom and Lucy Fairbrother. The campaign group said Mr Thom, 24, is from Edinburgh and Ms Fairbrother, 23, is from Cambridge.
The protest happened before the Olympic torch's arrival in Tiananmen Square. The British Embassy is investigating.
'Critical time'
Students for a Free Tibet named the American protesters on their website as Phill Bartell, 34, from New Jersey and Tirian Mink, 32, from Portland, Oregon. The group added that Lucy Fairbrother is also known as Lucy Marion.
The protesters scaled a 120ft (36.5m) lighting pole early in the morning and unfurled banners reading "One World One Dream Free Tibet" and "Tibet will be free".
Speaking on a mobile telephone, while suspended from the pole, Mr Thom told BBC News: "I'm here today because I've been a long-term Tibet activist and I feel like now is a really critical time for Tibet.
"The Beijing Games have been used by the Chinese government as a propaganda tool to whitewash their human rights record in Tibet."
We have taken non-violent action at this critical time to draw the world's attention to the crisis gripping Tibet
Lhadon Tethong
Students for a Free Tibet
Clandestine Olympic protests
A British Embassy spokesman said: "We are aware of reports of two British nationals being detained."
"We are in touch with the Chinese authorities and are requesting immediate consular access should this information be correct," he added.
Lhadon Tethong, executive director of Students for a Free Tibet, described the protesters as "brave young activists".
She said: "At this very moment, Tibetans are facing the most severe and violent repression they have seen in decades at the hands of the Chinese government, and we have taken non-violent action at this critical time to draw the world's attention to the crisis gripping Tibet."
Dr Kerry Brown, an expert on Chinese issues with London-based think tank, Chatham House, said the Chinese authorities would be "assessing the situation" following the protest.
He told BBC News: "They are very nervous, obviously, because of the opening ceremony tomorrow and they don't want to spoil that."
Activist explains the motive behind his protest
But Dr Brown added that if he was "brutally" honest, most Chinese were less concerned about the situation in Tibet than with their country's economy.
The Olympic torch has travelled 87,000 miles (140,000 km) through six continents since leaving Greece in March.
It's journey has been marked by protests about China's human rights record and its policies in Tibet.
During the month in which the torch began its progress, protests flared in Tibet against Chinese rule before snowballing into the worst unrest in Tibet for 20 years.
The Chinese Embassy could not be reached for comment.
original article - http://news.bbc.co.uk/1/hi/uk/7544416.stm
Comments
Hide the following 3 comments
Does the Free Tibet movement really want a free Tibet?
06.08.2008 14:03
The USA however has always been interested in the Free Tibet movement. The CIA backed the coup attempt in 1959 (for one piece of evidence go to http://www.youtube.com/watch?v=tOhDBo6x2ZY). The National Endowment for Democracy (part of the State Department created as a front by well known democrat Reagan to fund America’s enemies enemies) continues to fund the Tibetan propaganda machine http://www.ned.org/grants/06programs/grants-asia06.html#chinaTibet
America has a long history of funding undesirables including the Mojahadean in Afghanistan and Noriega in Panama. Only to realise that they were funding criminals or nutcases. I fear the pattern is being repeated.
Ayatollah Watch
I'm with the Ayatollah
06.08.2008 16:44
Imagine at the 2012 Olympics if a couple of Chinese odd-balls put up 'free Wales' banners. They would be afforded time in the back of a police van and sent on the next plane home. As Ayatollah mentions Tibet wasn't exactly a model of democracy when it was 'free'. In fact the country was at the stone age regarding agriculture, the Chinese put in a railway, opened up trade so the people have more than grain to eat and 'over-ran' the place a lot less than the English in Wales.
Just because the BBC have to make a song and dance about Tibet does not mean there is a real issue, it's just the Western framing. One day the Free Tibet losers will grow out of it, probably to get on the housing ladder rather than to effect change in Guantanamo.
Pol Pot
Two wongs don't make a white but they sure made some gold
26.08.2008 23:02
As in the past, the 'West' takes the high moral ground and must 'bring human rights to China ', just like its missionaries of old had to bring Christianity to the barbaric savages.
How wonderfully condescending and patronising of these altruistic globo-cops.
Yinyang