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Yemeni officials: US drone strike kills 4 suspected al-Qaida fighters travelling by car

  • A man walks on the rubble of a wedding hall destroyed by a Saudi-led airstrike in Sanaa, Yemen, Friday, July 10, 2015. More than 3,000 people have been killed since March, when a Saudi-led and U.S.-backed coalition began launching airstrikes against the rebels who seized control of the capital and other cities starting September. (AP Photo/Hani Mohammed)

    A man walks on the rubble of a wedding hall destroyed by a Saudi-led airstrike in Sanaa, Yemen, Friday, July 10, 2015. More than 3,000 people have been killed since March, when a Saudi-led and U.S.-backed coalition began launching airstrikes against the rebels who seized control of the capital and other cities starting September. (AP Photo/Hani Mohammed)  (The Associated Press)

  • Shiite fighters, known as Houthis, ride in a pickup while patrolling in a street in Sanaa, Yemen, Friday, July 10, 2015. More than 3,000 people have been killed since March, when a Saudi-led and U.S.-backed coalition began launching airstrikes against the rebels who seized control of the capital and other cities starting September. (AP Photo/Hani Mohammed)

    Shiite fighters, known as Houthis, ride in a pickup while patrolling in a street in Sanaa, Yemen, Friday, July 10, 2015. More than 3,000 people have been killed since March, when a Saudi-led and U.S.-backed coalition began launching airstrikes against the rebels who seized control of the capital and other cities starting September. (AP Photo/Hani Mohammed)  (The Associated Press)

  • Smoke rises after a Saudi-led airstrike in Sanaa, Yemen, Friday, July 10, 2015. More than 3,000 people have been killed since March, when a Saudi-led and U.S.-backed coalition began launching airstrikes against the rebels who seized control of the capital and other cities starting September. (AP Photo/Hani Mohammed)

    Smoke rises after a Saudi-led airstrike in Sanaa, Yemen, Friday, July 10, 2015. More than 3,000 people have been killed since March, when a Saudi-led and U.S.-backed coalition began launching airstrikes against the rebels who seized control of the capital and other cities starting September. (AP Photo/Hani Mohammed)  (The Associated Press)

Yemeni security and military officials say a suspected U.S. drone strike killed four al-Qaida members travelling by car in the coastal city of Mukalla.

The officials say the airstrike took place on Friday night in Mukalla, the capital of Yemen's sprawling eastern Hadramawt province. The explosion was heard in some parts of the city.

Al-Qaida's Yemen branch, considered to be the most dangerous offshoot of the terror network, has made gains in the province and captured Mukalla earlier this year.

The officials say at least five other militants were wounded in the airstrike. The officials spoke on condition of anonymity because they are not authorized to talk to reporters.

Al-Qaida has profited from the turmoil that has engulfed Yemen and U.S. drones have continued to target top al-Qaida leaders there.