Dozens killed in airstrike at refugee camp in Yemen

SANAA, Yemen — An airstrike killed dozens of people Monday at a camp for displaced people in northern Yemen, in what appeared to be the single deadliest attack since a Saudi ­Arabia-led coalition sent warplanes to target Shiite insurgents advancing across the country.

As many as 40 people died and about 200 were wounded in the attack on the Mazraq camp in Hajjah province, said Joel Millman, a spokesman for the International Organization for Migration, which runs aid programs at the facility.