Yemeni President Hadi arrives in Egypt for Arab League summit . Airstrikes pound Sanaa on Friday night . Yemen has been hit by a wave of violence since March 26, when Shiite rebels seized control of the capital and forced out Hadi.
Yemeni President Hadi arrives in Egypt for Arab League summit . Airstrikes pound Sanaa on Friday night . The strikes target the Houthis , who are Shiite Muslims backed by Iran .