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Yemeni officials: Helicopter gunship belonging to Saudi-led coalition hit truck, killing 9

  • A girl plays with a balloon, inside a school where she is living with  her displaced family who fled their home after a Saudi-led airstrike destroyed their houses, in Sanaa, Yemen, Thursday, May 14, 2015. The conflict in Yemen has killed more than 1,400 people — many of them civilians — since March 19, according to the U.N. The country of some 25 million people has endured shortages of food, water, medicine and electricity as a result of a Saudi-led blockade. (AP Photo/Hani Mohammed)

    A girl plays with a balloon, inside a school where she is living with her displaced family who fled their home after a Saudi-led airstrike destroyed their houses, in Sanaa, Yemen, Thursday, May 14, 2015. The conflict in Yemen has killed more than 1,400 people — many of them civilians — since March 19, according to the U.N. The country of some 25 million people has endured shortages of food, water, medicine and electricity as a result of a Saudi-led blockade. (AP Photo/Hani Mohammed)  (The Associated Press)

  • Displaced boys who fled their home after a Saudi-led airstrike destroyed their houses, live in a school in Sanaa, Yemen, Thursday, May 14, 2015. The conflict in Yemen has killed more than 1,400 people — many of them civilians — since March 19, according to the U.N. The country of some 25 million people has endured shortages of food, water, medicine and electricity as a result of a Saudi-led blockade. (AP Photo/Hani Mohammed)

    Displaced boys who fled their home after a Saudi-led airstrike destroyed their houses, live in a school in Sanaa, Yemen, Thursday, May 14, 2015. The conflict in Yemen has killed more than 1,400 people — many of them civilians — since March 19, according to the U.N. The country of some 25 million people has endured shortages of food, water, medicine and electricity as a result of a Saudi-led blockade. (AP Photo/Hani Mohammed)  (The Associated Press)

  • Girls play with balloons, inside a school where they are living with their displaced families who fled their home after a Saudi-led airstrike destroyed their houses, in Sanaa, Yemen, Thursday, May 14, 2015. The conflict in Yemen has killed more than 1,400 people — many of them civilians — since March 19, according to the U.N. The country of some 25 million people has endured shortages of food, water, medicine and electricity as a result of a Saudi-led blockade. (AP Photo/Hani Mohammed)

    Girls play with balloons, inside a school where they are living with their displaced families who fled their home after a Saudi-led airstrike destroyed their houses, in Sanaa, Yemen, Thursday, May 14, 2015. The conflict in Yemen has killed more than 1,400 people — many of them civilians — since March 19, according to the U.N. The country of some 25 million people has endured shortages of food, water, medicine and electricity as a result of a Saudi-led blockade. (AP Photo/Hani Mohammed)  (The Associated Press)

Yemeni officials say a helicopter gunship belonging to the Saudi-led coalition targeting Yemen's Shiite rebels has hit a truck in the country's north, killing nine people travelling in the vehicle.

Security and military officials say the attack took place early on Thursday in the northern Saada province, which is a stronghold of the Iran-backed rebels known as Houthis.

The officials say the truck was suspected of carrying rebel weapons. They spoke on condition of anonymity because they are not authorized to speak to the media.

The Houthis last year captured Yemen's capital, Sanaa, and much of the country's north.

The attack came on the second of a five-day humanitarian cease-fire that began nearly seven weeks after the coalition began airstrikes against the Houthis and their allies.