People search the rubble after a US air strike on Saada, northern Yemenbr br Images taken on March 15 show people searching through the rubble following a US air strike on Saada, northern Yemen. The first US strikes against Yemen's Houthis since Donald Trump took office killed 31 people, the rebels said, with the US president warning "hell will rain down upon" the Iran-backed group if it did not stop attacking shipping.