A Saudi-led air strike on a Houthi rebel stronghold in Yemen's northern mountains killed 23 people early on Saturday, tribal sources said. The strike targeted a munitions factory in Saqayn, near Saada, the sources said. Coalition aircraft also bombed the rebel-held capital Sanaa, targeting an arms warehouse and the air defense headquarters, witnesses said. The coalition launched airstrikes against the rebels in March, after the Houthis seized control of much of the country prompting President Abed Rabbo Mansour Hadi to take refuge in neighboring Saudi Arabia.