Yangon: A court in military-ruled Myanmar has sentenced four opposition party officials to seven years in jail during a closed trial at the notorious Insein Prison, a party spokesman said Friday.

The two men and two women, all officials of Aung San Suu Kyi’s National League for Democracy party, were arrested in June for alleged links to an illegal organization, said party spokesman U Lwin.

He didn’t say which organization the four were accused of having ties with.

During the trial Thursday in the prison on the outskirts of Yangon, the court passed judgment based on confessions given by the officials to intelligence agents during their interrogation, U Lwin said.

U Lwin said that NLD lawyers who represented the defendants told him that the prosecution failed to provide supporting evidence or produce any independent witness to prove their guilt. There were also several procedural loopholes, he said without elaborating.

NLD’s legal committee will appeal, U Lwin said. He identified the four as Ma Than Htay, Tin Myint, Ma Yi Yi Win and San Ya. Details of the charges against them were not immediately known.

In a separate development, authorities detained Ko Pauk Sa, the NLD head of Sanchaung township, on Wednesday night, but it is not clear whether he was taken in for questioning or had been arrested, U Lwin said.

The military government, which has long been criticized for its poor human rights record, holds more than 1,000 political prisoners in jails.

The junta came to power in 1988 after crushing a pro-democracy uprising. It called elections in 1990 but refused to hand over power when the NLD won. Suu Kyi is currently under house arrest.