A hospital in a rural area of northwest Yemen was hit by an airstrike Tuesday killing seven people and wounding eight others, Save the Children said.
The international aid organization, which supports the hospital, said in a statement sent to the Associated Press that four of those killed were children and two adults are unaccounted for.
Save The Children said a missile struck a petrol station near the entrance to Ritaf rural hospital, about 100 kilometers from the city of Saada at 9:30 a.m. local time on Tuesday.
"The missile was said to have landed within 50 meters of the facility's main building," it said.
The organization said the hospital had been open for half an hour and many patients and staff were arriving on a busy morning.
Among the dead were a health worker and the worker's two children and a security guard, it said.
Save the Children, which reported earlier this week that 37 Yemeni children a month had been killed or injured by foreign bombs in the last year, demanded an urgent investigation into the attack.
Helle Thorning-Schmidt, the organization's chief executive, said: "We are shocked and appalled by this outrageous attack." "Innocent children and health workers have lost their lives in what appears to been an indiscriminate attack on a hospital in a densely populated civilian area," she said.
"Attacks like these are a breach of international law."
Thorning-Schmidt said the hospital is one of many Save the Children supports in Yemen, "but time after time, we see a complete disregard by all warring parties in Yemen for the basic rules of war."
UN humanitarian chief Mark Lowcock has said about 80 percent of Yemen's population 24 million people need humanitarian assistance including nearly 10 million "just a step away from famine" and nearly 240,000 "facing catastrophic levels of hunger."
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