Smoke rises after a Saudi-led airstrike hit a site believed to be a munitions storage, in Yemen’s capital, Sanaa, on Monday, May 11, 2015. Yemeni security officials said Sanaa came under heavy air bombardment on Monday afternoon, with the primary target being weapons and ammunition depots on Noqom mountain on the city’s northeastern outskirts. The bombing unleashed a series of explosions, with shells flying out and hitting residential areas and starting fires.