Those killed include an Egyptian man and two Iraqi women, CNN reported. The executions took place despite a call by the United Nations to cease prisoner executions and greater transparency in terror-related criminal proceedings.
CNN said 70 people have been executed in Iraq so far this year, with Human Rights Watch reporting 120 individuals were put to death between 2011 and 2012.
The executions coincide with a spike in sectarian violence in the nation. The United Nations estimated 2,800 Iraqi civilians have been killed since May when clashes between ethnic Sunnis and Shiite Muslims intensified.
The Shiite-dominated Iraqi government has placed blame for the violence on Sunni terrorists with ties to al Qaida.
Benedict Cumberbatch's dramatic reading of R. Kelly lyrics is just what you need
Exploding whale video goes viral on Internet