SANAA, Feb. 4 (Xinhua) -- Two people were killed Sunday when the Saudi-led coalition warplanes hit a forensic laboratory in Yemen's capital Sanaa, residents and a Xinhua photographer at the scene witnessed.

Twenty others were wounded in the two airstrikes on the forensic laboratory building in the northern part of rebels-held Sanaa, the photographer said.

Residents said that many civilians were among the casualties. Houthi officials who control the laboratory declined to comment.

The attack was the latest in a series of airstrikes conducted by the U.S.-backed coalition air force since the start of the war in Yemen three years ago.

On Jan. 22, a Saudi-led airstrike killed a family of seven in the Yemeni northern province of Saada, according to provincial security officials.

The Saudi-led coalition has intervened in the Yemeni conflict since March 2015 in an attempt to roll back the Houthi militants and support the internationally-recognized President Abd-Rabbu Mansour Hadi, who was forced into exile by the Houthis.

The war has killed over 10,000 Yemenis, mostly children, and displaced 3 million others, creating one of the world's worst humanitarian crises.