Singapore: Myanmar’s prime minister is being treated in one of Singapore’s public hospitals for a “serious” undisclosed illness, the military-ruled country’s embassy said Wednesday.

Prime Minister Gen. Soe Win arrived in Singapore late last month on a private visit, an official from the Myanmar Embassy in Singapore said on condition of anonymity, citing protocol.

The official said details on Soe Win’s condition were not available, but said it was a “serious health matter” that required a team of doctors.

“From our embassy’s side, we give a lot of logistical support, but for the medical side, it’s being taken care of by the hospital, so we are not in the position to comment,” the official said, adding it was not clear when Soe Win would be discharged.

The Irrawaddy, a respected online magazine put out by Myanmar journalists exiled in Thailand, has cited unconfirmed reports that Soe Win may be suffering from leukemia and has asked for retirement.

Soe Win replaced the relatively moderate former Prime Minister Gen. Khin Nyunt, who was removed on charges of corruption and insubordination in 2004.

Soe Win is the second of Myanmar’s ruling junta to seek medical care in Singapore this year. In January, junta leader Senior Gen. Than Shwe, 73, was treated at the same hospital after arriving in the city-state on Dec. 31. Than Shwe is believed to be suffering from diabetes, hypertension and other ailments.

Myanmar’s military seized power in 1988 after violently suppressing pro-democracy protests. It held a general election in 1990, but refused to recognize a landslide victory by democracy activist and Nobel Peace Prize winner Aung San Suu Kyi’s party.