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Saudi-led coalition targeting Shiite rebels in Yemen kills at least 20 civilians in airstrikes

Shiite rebels known as Houthis wearing army uniforms stand guard in front of Yemen's Defense Ministry building after it was damaged by Saudi-led airstrikes in Sanaa, Yemen, Wednesday, June 10, 2015. A series of airstrikes by the Saudi-led military coalition on Tuesday struck the building, which is under the control of Shiite rebels who last year seized the capital, Sanaa, officials said. (AP Photo/Hani Mohammed)

Shiite rebels known as Houthis wearing army uniforms stand guard in front of Yemen's Defense Ministry building after it was damaged by Saudi-led airstrikes in Sanaa, Yemen, Wednesday, June 10, 2015. A series of airstrikes by the Saudi-led military coalition on Tuesday struck the building, which is under the control of Shiite rebels who last year seized the capital, Sanaa, officials said. (AP Photo/Hani Mohammed)  (The Associated Press)

Witnesses and officials in Yemen say a Saudi-led airstrike hit a public bus on a highway north of the southern city of Aden, splitting the vehicle in half and killing at least 20 civilian passengers.

They said Thursday that airstrikes also hit a family traveling in a private car and a farmer driving a pick-up truck loaded with potatoes, also near Aden, over the last 48 hours.

A senior military official running an operations room in Aden allied with the Saudi-led coalition said he complained to the Saudis about the incidents. The officials and witnesses spoke on condition of anonymity for fear of reprisal.

Iranian-backed Shiite rebels, known as Houthis, seized the Yemeni capital last year. The U.S.-backed coalition began targeting them with airstrikes on March 26.