The soldier -- a member of Yemen's government intelligence services -- carried out the killings "suddenly and without the consent of his colleagues" during an interrogation on Saturday, the source said.
According to the source, the soldier's colleagues were "angered" by the killings, but he did not face repercussions.
Tribal leaders confirmed the revenge killings to AFP.
The jihadist detainees were captured during a military operation last week in the district of Wadea in Abyan province, a stronghold of Al-Qaeda in southern Yemen.
Yemeni forces backed by a Saudi-led coalition on Thursday managed to drive Al-Qaeda militants from Wadea, which is symbolic as the birthplace of President Abedrabbo Mansour Hadi.
Al-Qaeda in the Arabian Peninsula, which the United States views as the network's most dangerous branch, has exploited more than two years of conflict between Hadi's government and Shiite Huthi rebels who control the capital to expand its presence.
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