Who are the Houthis and why are they attacking Saudi Arabia?
The Iran-backed Houthi rebel group in Yemen struck the airport of the capital city of Saudi Arabia for the second day in a row on Sunday, after a missile attack on Saturday killed at least 13 people and caused the United States to consider intervening.
The Houthis have targeted the airport four times in the past week, as Saudi-led forces pressed a counteroffensive against the rebels in Yemen after they seized the Bab al-Mandeb Strait.
So who are they and what do they want?
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