Chinese security forces were deployed to deter Tibetans from contacting a UN human rights delegation that visited Tibet last November, according to news just received from unofficial sources in the city, who say that ten days after the team left four monks were arrested for staging a demonstration linked to the visit. UN officials were apparently unaware that they were surrounded by plainclothes police, that monks were banned from the main temple area during the visit, and that military helicopters flew low over the Tibetan quarter of the city as a deterrent, say Tibetans and tourists who were in the city. 20 Tibetans who attempted to submit information to the delegation smuggled news out to TIN, an independent information organisation in London, after giving up the attempt to reach the UN. At least four people have sent written protests saying that they were unable to reach the delegation because of security operations.