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The official said the attackers surprised the soldiers early Sunday at their checkpoint guarding oil and gas projects in the Radhum area of Shabwa province.
The ambush follows a two-week-long spike in suspected U.S. drone strikes targeting al-Qaida. Yemeni officials say nine attacks have killed 38 alleged militants.
The official spoke on condition of anonymity according to regulations.
The U.S. considers the local al-Qaida branch, also known as al-Qaida in the Arabian Peninsula, to be the world's most active. Washington last week flew diplomatic staff out of Yemen's capital over fears of a terrorist attack.
By The Associated Press
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