Three soldiers of the security belt forces killed on Wednesday in a bomb explosion targeting a vehicle security in the Directorate of Mahfad Abyan province, "southern Yemen".
Security sources said that the device exploded during the passage of security vehicle north of the region, killing three soldiers and wounding others.
The security belt forces are carrying out a security crackdown on al-Qaeda militants who controlled the Directorate.
The Saudi-led Arab coalition launched an large-scale security campaign in late January to hunt down al-Qaeda-linked individuals in Abyan province, where extremist groups are active.
For years, Abyan has been a stronghold of Islamist militants and al Qaeda in the Arabian Peninsula, which Washington ranks as the world's most dangerous branch of the organization.
Al-Qaeda in the Arabian Peninsula (AQAP) has used the three-and-a-half-year-old war in Yemen and expanded its influence in many areas in the south, east and central Yemen, including Abyan, Hadramout, Shabwa, Al-Bayda, Marib and Jouf.
The United Arab Emirates formed and trained the security belt forces in southern and southeastern regions to fight Al-Qaeda and to restore stability after the Houthis were driven out of these regions.
The Gulf state is a member in an Arab coalition led by Saudi Arabia which has been fighting the Houthis to restore the government of internationally recognized president Abdrabbuh Mansur Hadi since March 2015.