The political party of democracy activist Aung San Suu Kyi told a U.N. envoy Wednesday that Myanmar's decision to keep her under house arrest for a sixth year violates her human rights.

The junta's ruling in May to extend Suu Kyi's detention by one year sparked international outrage and Suu Kyi's National League for Democracy party denounced the extension as illegal. Her party tried to fight the case in court but the government has so far rejected its appeal.

During a 10-minute meeting with U.N. rights investigator Tomas Ojea Quintana, three senior NLD members complained about Suu Kyi's treatment.

"Our party leaders told the envoy that rejection of the appeal against Daw Aung San Suu Kyi's detention was violation of human rights," NLD spokesman Nyan Win said.

Nyan Win also said the NLD discussed the continued detention of people arrested in last year's demonstrations over rising fuel prices and their concerns over the approval of a constitutional referendum in May that paves the way for election in 2010. The constitution is viewed by many as flawed.

It was unclear whether Quintana would meet Suu Kyi before he leaves Thursday.

Since his arrival Sunday, Quintana has met senior Buddhist monks, visited the cyclone-devastated Irrawaddy delta and met five of the countries most prominent political detainees inside the country's infamous Insein prison.

Quintana's visit comes just before the 20th anniversary of an uprising against the military junta. The government has already tightened security, fearing pro-democracy activists could launch anti-junta protests Friday to coincide with August 8, 1988, anniversary.

Myanmar has been under military rule since 1962. The current junta came to power in 1988 after crushing a nationwide pro-democracy movement, killing as many as 3,000 people. It called elections in 1990 but refused to honor the results after Suu Kyi's party won overwhelmingly.