Yemen's intelligence service, the National Security, has arrested on Wednesday morning six Yemenis who were released from Iraqi prisons.
Families of the detainees could not meet them at Sana'a Airport as they were taken to another gate and transferred to a custody of t he National Security.
A Yemeni human rights group, Hood, called to swiftly release the returnees and allow them to spend Eid al-Adha holiday, a Muslim religious holiday, with their families.
About 16 Yemenis including two women are still languishing in Iraqi jails. One man was sentenced to death, but the Yemeni authorities have recently received insurances that he will not be executed.
Prime Minister Mohammad Salem Basindwa had called the Iraqi authorities to extradite Yemenis imprisoned in Iraq.
The Iraqi Ambassador Assad Al-Samraee said, in a meeting with Yemeni officials, Iraq will positively respond to the demands of exchanging detainees between Yemen and Iraq.
Sana'a has witnessed protests carried out by relatives of Yemenis imprisoned in Iraq in which they demanded the Yemeni government to form a ministerial committee to follow up cases of Yemeni detainees held in Iraq.
Yemen nationals have been languishing at Iraqi prisons since nine years on charges of entering Iraq illegally.
According to human rights groups, Yemeni prisoners were not enabled to defend themselves or have lawyers.
A lawyer of a Yemeni human rights group, Hood, had said that Yemeni detainees face risks in Iraq, accusing the Yemeni government of ignoring their cases.