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A hospital supported by Doctors Without Borders (MSF) has been hit by airstrikes in Yemen, the medical charity confirmed on Monday.

The hospital in the northwestern province of Hajjah was hit at 3.45pm local time (12:45 GMT), the Paris-based NGO said in a Twitter post, adding that the number of casualties is still unknown.

"Yes, we confirm the news. A hospital that is run by MSF was hit by a couple of airstrikes today at 3.45pm local time. Right now we don't have more information. Medical staff are attending the wounded," MSF spokesperson Malak Shaher told RT.

According to Yemeni officials cited by AP, at least 20 people have been killed and injured in the strike that hit the hospital.

MSF says it has supported the hospital since July 2015, adding that 4,611 patients have been treated at the facility.

The incident comes less than two days after MSF accused the Saudi-led coalition of killing 10 children and injuring 28 more in a strike that hit a school in the Houthi rebel stronghold of Saada in northern Yemen.

The coalition denied targeting the school and claimed it hit a rebel camp where underage fighters were trained, AFP reports.