In the span of four days earlier this month, the Saudi Arabia-led coalition in Yemen bombed a Doctors Without Borders-supported hospital, killing 19 people; a school, where 10 children, some as young as 8, died; and a vital bridge over which United Nations food supplies traveled, punishing millions.

In a war that has seen reports of human rights violations committed by every side, these three attacks stand out. But the Obama administration says these strikes, like previous ones that killed thousands of civilians since last March, will have no effect on the American support that is crucial for Saudi Arabia’s air war.

On the night of Aug. 11, coalition warplanes bombed the main bridge on the road from Hodeidah, along the Red Sea coast, to Sana, the capital. When it didn’t fully collapse, they returned the next day to destroy the bridge.

More than 14 million Yemenis suffer dangerous levels of food insecurity — a figure that dwarfs that of any other country in conflict, worsened by a Saudi-led and American-supported blockade. One in three children under the age of 5 reportedly suffers from acute malnutrition. An estimated 90 percent of food that the United Nation’s World Food Program transports to Sana traveled across the destroyed bridge.