Detained Myanmar dissident Aung San Suu Kyi (search) underwent surgery Thursday for an unspecified gynecological condition, hospital officials said.

Suu Kyi, 58, was admitted to the Asia Royal Cardiac and Medical Center in the capital, Yangon, late Wednesday, a doctor at the facility said on condition of anonymity.

The hospital was guarded by more than a dozen undercover police and military intelligence officers after Suu Kyi, winner of the 1991 Nobel Peace Prize (search), was admitted.

Details of her condition were not immediately available, but doctors described the operation as a success and said there were no complications.

Members of Suu Kyi's National League for Democracy Party (search) said she would accept medical treatment only from her personal physician, Dr. Tin Myo Win, who was seen at the Asia Royal clinic early Thursday.

Suu Kyi was detained after a bloody clash between her supporters and a government-backed mob on May 30 while she was visiting northern Myanmar.

It was the third time Suu Kyi has been detained since 1989, when she was placed under house arrest for six years. She was detained for a second time in late 2000 before being released in May 2002 amid hopes a political settlement was imminent.

After her latest arrest, the junta cracked down on the NLD, ending a reconciliation process brokered in October 2000 by Razali Ismail, the U.N.'s special envoy to Myanmar.

Earlier this month, the State Department said it had received credible reports that Suu Kyi had begun a hunger strike, a claim that Myanmar officials strenuously denied. A Red Cross official later said that Suu Kyi was not fasting, after a team from the organization visited her.

The military seized power in 1988 after crushing a pro-democracy uprising in Myanmar, also known as Burma. It held elections in 1990, but refused to recognize the results after Suu Kyi's party won.