SANAA, Yemen • A bomb-laden drone launched by Yemen’s Shiite rebels exploded over a military parade Thursday for the Saudi-led coalition, killing at least six people in a brazen attack threatening an uneasy U.N.-brokered peace in the Arab world’s poorest nation.

The attack at the Al-Anad Air Base showed the unwillingness of Yemen’s Houthi rebels to halt fighting in the civil war, even if it doesn’t violate a peace deal reached last month in Sweden between them and Yemen’s internationally recognized government.

The Houthi attack near the southern port city of Aden with a new drone variant also raised more questions about Iran’s alleged role in arming the rebels with drone and ballistic missile technology, something long denied by Tehran despite researchers and U.N. experts linking the weapons to the Islamic Republic.

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