medicins sans frontieres
The medical aid group Doctors Without Borders says hundreds of children are among the dead.
After U.S. airstrikes destroyed a Kunduz hospital, Afghans must travel for days to reach life-saving treatment.
Two workers from Doctors Without Borders are among the dead.
The organization says it is the third severe incident in 3 months.
"Bombings are a daily reality for Yemenis, even inside hospitals."