© AFP/File Arash Ashourinia

TEHRAN (AFP) - Iranian opposition leader Mir Hossein Moussavi described as "unfair" the weekend hanging of five militants convicted over bomb attacks, according to his website.

"The announcement of the hanging of five people without a clear explanation of the charges and the unfair trial process resembles that resulted in convictions of the amazing men and women of our country," Moussavi said.

The statement on Kaleme.com appeared to be referring to the hanging in January of two dissidents convicted in connection with protests after incumbent Mahmoud Amadinejad defeated Moussavi in Iran's disputed June presidential poll.

On Sunday, Iran executed five militants after convicting them of bombing government offices and a gas pipeline to Turkey, the official IRNA news agency said.

"When justice is at the service of oppressors by supporting those who are in power, it is difficult to prevent the people from thinking these penalties are unfair," Moussavi said in the statement.

The five hanged on Sunday included a Kurdish woman, Shirin Alamhouli, and four others identified as Farzad Kamangar, Ali Heidarian, Farhad Vakili and Mehdi Eslamian.

Kamangar, Heidarian and Vakili, along with Alamhouli were members of the Kurdish rebel group, PJAK (The Party of Free Life of Kurdistan), ISNA news agency said quoting Tehran's prosecution office.

Eslamian reportedly belonged to the anti-regime monarchist group, Kingdom Assembly of Iran, which aims to restore the constitutional monarchy that was abolished by the 1979 Islamic revolution.

ISNA said the five were convicted of being "moharebs" or "enemies of God" -- a crime punishable by death under Iran's sharia-based Islamic law.