At least 20 people were killed and 15 others wounded when the Saudi-led warplanes attacked a hospital operated by the humanitarian association Doctors Without Borders (MSF) in Yemen's northwest province of Hajja on Monday, a MSF spokeswoman and an eyewitness told Xinhua.

"It is confirmed that a Saudi-led airstrike today hit a hospital run by MSF team since July 2015 in Abbs district," MSF spokeswoman Malak Shahir told Xinhua.

She said the doctor team is busy treating the injured.

An eyewitness told Xinhua that the airstrike destroyed a part of the hospital, but the hospital is still being operated by the MSF doctors.

He told Xinhua on condition of anonymity that a Spanish female doctor survived the airstrike and she is now treating the injured.

It's not the first time MSF-run hospitals were hit by the Saudi-led warplanes.

A few months ago, two MSF-run hospitals in neighboring Saada province were hit by several airstrikes, as the Saudi-led military coalition admitted its mistakes.

On Saturday, another Saudi-led airstrike raided a children school in Haidan district in Saada province, killing at least 10 students and injuring 28 others, according to a MSF statement.

The Saudi-led warplanes fighting Shiite Houthi rebels launched airstrikes against military targets of Houthis and their ally forces loyal to former President Ali Abdullah Saleh in several northern provinces on Monday, including the capital Sanaa, according to reports by Houthi-controlled Saba news agency.

Saudi Arabia and its allies intervened in support of exiled Yemeni government in 2015, but failed to bring it back to power in the rebel-held capital Sanaa.

The war and airstrikes have since killed over 6,400 people, mostly civilians.

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