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A suspected al-Qaida militant, center, gestures as he attends his trial in a state security court in Sanaa, Yemen, Tuesday, Jan. 22, 2013. U.N. agencies and other aid organizations appealed Tuesday for $716 million in donations to help Yemen which is wracked by militant attacks and instability deal with a deepening humanitarian crisis that includes widespread malnutrition in the Arabian peninsula's poorest country.
SANAA, Yemen—Yemeni security officials say an airstrike launched by a U.S. drone killed at least three suspected al-Qaida militants in a province near the Saudi border.

Tuesday's strike in the Jawf province northeast of the capital Sanaa was the fourth such attack to hit al-Qaida militants since Saturday, a higher-than-usual frequency that indicates a stepped up campaign by the Americans and their Yemeni government allies.

The security officials spoke on condition of anonymity because they were not authorized to speak to the media.

Al-Qaida in Yemen is considered among the world's most active branch of the network, having planned a series of foiled or aborted attacks on U.S. territory.

The United States rarely comments on its military role in Yemen, but has acknowledged targeting al-Qaida militants in the past.