Iran on Thursday hanged three men convicted of murdering a man in the city of Qazvin, north of the country, the Fars news agency reported.
The report did not identify them but said that the murder occured five years ago. There was no additional information.
The hanging brings to 231 the number of executions in Iran so far this year, according to an AFP tally based on media and official reports.
Human Rights Watch counted 388 executions in Iran in 2010, while Amnesty International put the figure at 252, ranking the Islamic republic second only to China in the number of people put to death last year.
Tehran says the death penalty is essential to maintain law and order, and that it is applied only after exhaustive judicial proceedings.
Murder, rape, armed robbery, drug trafficking and adultery are among the crimes punishable by death in Iran.