Saturday's air raids in northern al-Jawf province came hours after the Houthis said they had shot down a Saudi fighter jet in the same area with an advanced surface-to-air missile.
"Preliminary field reports indicate that ... as many as 31 civilians were killed and 12 others injured in attacks that hit al-Hayjah area of al-Maslub district in al-Jawf governorate," said a statement from the office of the UN resident coordinator and humanitarian coordinator for Yemen.
The statement said "humanitarian partners" deployed rapid response teams to provide medical assistance to the wounded, many of whom were being transferred to hospitals in al-Jawf, as well as the capital, Sanaa.